Every rockhounding spot on one map

Sussex County, New Jersey

Franklin is called the Fluorescent Mineral Capital of the World, and its Buckwheat Dump is where visitors can still collect the glowing willemite, calcite, and franklinite that made the district famous. The ore body formed in Precambrian Franklin Marble under extreme heat and pressure, producing the richest mineral-species diversity of any locality on Earth, more than 350 species. Under shortwave ultraviolet light the finds glow green and red.

Epidote, Pyrite, Fluorite

Sussex County, New Jersey

Sterling Hill in Ogdensburg is the twin of the Franklin deposit and the last of the district's zinc mines to close, now preserved as a mining museum. Its Mine Run Dump is open for fee collecting, yielding fluorescent willemite and calcite along with franklinite and zincite from the same Precambrian Franklin Marble ore body. Zincite and franklinite were first described as mineral species from this district.

Willemite, Zincite, Calcite, Fluorite

Maricopa County, Arizona

San Domingo Wash is a documented Au-Pt placer district in the western foothills of the Wickenburg Mountains, with Mindat and USGS-derived records tying the gold to stream-placer concentration. It stands out for Phoenix-area collectors because the target is a named historic placer system, not scattered speculative gold ground.

Gold

Pima County, Arizona

Neptune Mine is a focused Arizona fluorite locality, with Mindat and MRDS records describing a former fluorspar mine where fluorite occurs in lenses and stringers along a schist-granite contact zone. The site adds mineral diversity to the Arizona list because it is a documented industrial-mineral occurrence rather than another chalcedony or placer-gold wash.

Fluorite

Maricopa County, Arizona

Red Rover is a compact Cave Creek district copper-silver stop, with Mindat listing chalcocite and tetrahedrite-group minerals and Western Mining History tying the mine to copper, silver, and gold. It is notable because those sulfide minerals give the Maricopa County list a real ore-mineral locality, not just agate, jasper, and quartz float.

Chalcocite, Tetrahedrite

Greenlee County, Arizona

Black Hills is one of Arizona's clearest public fire-agate localities, with BLM stating that fire agate is the principal attraction and that the site is open for public digging without fees or permits. The locality stands out because the collecting target is specific, chalcedony with opal-like color play in volcanic deposits, and the land manager publishes both access and collecting context.

Fire Agate, Chalcedony

Greenlee County, Arizona

Fire agate is the reason the York and Duncan country earns the first Arizona slot: BLM identifies the nearby Round Mountain area as a public rockhounding destination, and its Arizona brochure lists fire agate as a notable Safford Field Office gemstone. The broader York area adds banded agate, carnelian, and jasper, so the site represents southeastern Arizona's volcanic chalcedony ground rather than a single-mine specimen stop.

Fire Agate, Banded Agate, Carnelian, Jasper

Mohave County, Arizona

Kingman Feldspar Mine represents northwestern Arizona pegmatite collecting, with documented feldspar-quartz workings and rare-earth allanite from the Kingman area. It rounds out the top 10 because the mineral suite, microcline, quartz, and allanite, is geologically different from Arizona's better-known fire agate, turquoise, and placer-gold localities.

Allanite, Microcline, Quartz

Mohave County, Arizona

Meadow Creek Pass belongs to the same western Arizona volcanic-desert collecting belt that gives Mohave County its agate, chalcedony, jasper, and fire-agate reputation. It earns a place because the material suite is broader than a single color of agate, while BLM's Arizona guidance specifically flags fire agate on Kingman Field Office public lands.

Fire Agate, Grape Agate, Chalcedony, Jasper

Yavapai County, Arizona

Rich Hill is Arizona's benchmark coarse-gold placer, documented by USGS as part of the Weaver district and by later geochemical work for nugget-rich placer units. Its importance is not just production history: the locality is specifically known for surface and shallow placer gold concentrated around Rich Hill, Antelope Creek, and Weaver Creek.

Gold Nugget

Mohave County, Arizona

Burro Creek is a Mohave County agate landmark, with Mindat recording both the Burro Creek agate occurrence and agate in the Lower Burro Creek Wilderness Area. The site is especially useful for lapidary collectors because the material is colorful chalcedony-family float tied to a well-known BLM desert drainage, not a vague county-wide agate listing.

Pink Agate

Gila County, Arizona

Diamond Point is a managed Forest Service crystal site where clear, doubly terminated quartz crystals weather out of cavities in the Devonian Martin Formation. The combination of published geology, a defined 35-acre collection area, and a 10-pound-per-person daily limit makes it one of Arizona's strongest legal quartz localities.

Quartz

Hot Spring County, Arkansas

Magnet Cove is a classic alkaline igneous complex, noted in USGS work for nepheline syenite, carbonatite, and titanium-bearing minerals such as perovskite and titanite. Its unusual Cretaceous intrusive rocks make this small Hot Spring County area one of Arkansas's most mineralogically distinctive collecting districts.

Sphene, Nepheline Syenite

Hot Spring County, Arkansas

Kimzeyite and perovskite give the Cove Creek Bridge area its weight: Perovskite Hill and the nearby Kimzey carbonatite localities are documented Magnet Cove occurrences rather than generic creek gravel. The appeal is the chance to study loose material tied to Arkansas's alkaline-carbonatite complex, where apatite, magnetite, monticellite, and zirconium-bearing garnet occur in a tight geologic setting.

Apatite, Monticellite, Magnetite, Perovskite

Montgomery County, Arkansas

Clear hydrothermal quartz is the draw here, part of the Ouachita Mountain quartz belt that USGS and the Arkansas Geological Survey describe as one of western Arkansas's signature mineral resources. The Mount Ida area is especially useful because quartz-bearing veins and crystal pockets occur close to established digging operations.

Quartz

Montgomery County, Arkansas

Mount Ida sits in the heart of Arkansas's Ouachita quartz province, where hot fluids moved through fractured Paleozoic sandstone, shale, and chert to form crystal-bearing veins. That regional geology, documented by USGS and the Arkansas Geological Survey, is why the area remains the state's clearest benchmark locality for rock crystal collecting.

Quartz

Montgomery County, Arkansas

Mauldin Mountain wavellite is not an interchangeable green phosphate, Mindat and Arkansas Geological Survey references tie the quarries to botryoidal wavellite, variscite, planerite, and related phosphate minerals. The locality stands out because the best material shows radial, spherical aggregates that make the Montgomery County occurrence recognizable in collections.

Wavellite

Pike County, Arkansas

Crater of Diamonds is exceptional because visitors search the eroded surface of a diamond-bearing Prairie Creek lamproite and may keep diamonds and other minerals they find. Arkansas State Parks and the Arkansas Geological Survey both document the park's volcanic pipe, its 37-acre search field, and its companion minerals, including amethyst, garnet, jasper, and agate.

Diamond, Amethyst, Garnet, Jasper

Pike County, Arkansas

Prairie Creek is the geologic source behind the Crater of Diamonds field, a lamproite diatreme with diamonds plus mantle and alteration minerals such as chrome diopside, epidote, garnet, hematite, and amethyst. Its value as a rockhounding landmark comes from that rare volcanic pipe, not from ordinary stream gravel.

Amethyst, Diopside, Epidote, Garnet

Marion County, Arkansas

Yellville belongs to north Arkansas's historic lead-zinc belt, where Arkansas Geological Survey summaries record galena, sphalerite, and smithsonite production from Marion County and nearby Ozark districts. The mine-dump setting is notable because it exposes a compact suite of sulfide and carbonate zinc minerals in a state better known to many collectors for quartz and diamonds.

Galena, Pyrite, Smithsonite, Sphalerite

Garland County, Arkansas

The south side of Lake Catherine is tied to Garland County fluorite occurrences noted in Arkansas Geological Survey mineral-deposit reports and Mindat locality records. That makes the site a focused stop for a single, recognizable mineral rather than a broad mixed-gravel locality.

Fluorite

Saline County, Arkansas

Saline County is one of the two districts in the Arkansas bauxite region, a roughly 275-square-mile belt described by the Arkansas Geological Survey and USGS as the state's historic aluminum-ore province. The quarries stand out because the material is tied to weathered syenite and related intrusive rocks rather than ordinary clay or ironstone.

Bauxite, Heliotrope Bauxite

Siskiyou County, California

Happy Camp gives the top-10 list a Klamath Mountains jade and gold locality rather than another Mojave silica field. Mindat records ferro-actinolite-tremolite series material at the Chan Jade Mine and placer native gold from the Happy Camp region, which fits the area's serpentinite and historic placer-mining setting.

Jade, Gold, Serpentine, Gold-laced Jade

Trinity County, California

The Trinity River is a north-state benchmark because it combines historic placer-gold country with Klamath Mountains metamorphic and ultramafic source rocks. USGS mapping documents the basin's complex bedrock setting, while the RockHoundR candidate minerals add chalcedony, jasper, jade, and petrified wood to the river's placer-gold identity.

Chalcedony, Gold, Jasper, Jade

Siskiyou County, California

Glass Mountain represents California's northern volcanic-glass collecting better than any ordinary agate wash, with Forest Service materials identifying designated obsidian collecting areas in the Modoc country. Mindat's Siskiyou County records place Glass Mountain and Little Glass Mountain among mapped pumice and obsidian-related localities, tying the material directly to young Cascade volcanism.

Obsidian

Fresno County, California

Jacolitos Canyon adds a Coast Range sedimentary and fossil-bearing locality to a list otherwise dominated by volcanic glass, agate, jade, and gold. USGS work on the Coalinga district documents the Jacalitos fossil context, while the candidate record makes the site useful for jasper, petrified wood, and fossilized coral on lawful public ground.

Jasper, Petrified Wood, Fossilized Coral

Santa Clara County, California

New Almaden is not just a cinnabar stop, it is one of California's classic mercury districts, hosted in altered serpentinite and silica-carbonate rock. Mindat records cinnabar, native mercury, metacinnabar, apophyllite, gyrolite, chalcedony, and opal, while USGS Professional Paper 360 makes the district one of the state's best documented quicksilver localities.

Chert, Cinnabar, Apophyllite, Gyrolite

Monterey County, California

Big Sur is California's clearest public jade locality because sanctuary rules specifically allow loose nephrite collection in the Jade Cove authorized area below mean high tide. Mindat records jade and nephrite at Big Sur, and Los Padres National Forest planning documents note historic jade collecting around Plaskett Creek, Jade Cove, Willow Creek, and offshore.

Jade, Nephrite, Serpentine

Riverside County, California

The Wiley Well and Mule Mountains area is one of California's best documented public desert collecting districts, with BLM specifically identifying the Wiley Well District Geode Beds for rockhounding. Mindat records nearby fire agate, chalcedony, agate, amethyst, quartz, and opal, giving the area more mineral range than a single-specimen stop.

Chalcedony, Fire Agate

San Bernardino County, California

Afton Canyon pairs documented BLM rockhounding access with a strong Mojave silica suite: Mindat lists opal, opalite, chalcedony, plume agate, agate-jasper, petrified wood, and jasper in the canyon area. The locality also has unusual field context because the Mojave River flows above ground here year-round, cutting through one of the region's more recognizable volcanic and sedimentary exposures.

Opalite, Jasper

Kern County, California

The El Paso Mountains stand out because BLM identifies the area as a place where rock hounds find material among dark volcanic mesas, red buttes, and fossil-bearing badlands. Mindat ties the range and its Last Chance Canyon localities to agate-jasper, opal, gold, and petrified wood, a compact record of Mojave volcanic and sedimentary collecting.

Agate, Opal, Jasper, Gold

Kern County, California

Gem Hill is a focused Kern County silica locality, with Mindat recording agate, chalcedony, iris agate, jasper, petrified wood, native gold, and uranium minerals nearby. Its appeal is the Rosamond Hills mix of lapidary material and desert mineralization, but claim and parcel checks matter because the district has a long mining history.

Agate, Chalcedony, Jasper, Uraninite

Chaffee County, Colorado

Mount Antero is the highest gem locality in the United States, with aquamarine and beryl occurring in granite cavities above timberline near its 14,269-foot summit. Aquamarine is Colorado's state gemstone, and the peak also yields phenakite, topaz, smoky quartz, and fluorite. The collecting ground lies in San Isabel National Forest, where the Forest Service permits casual hand-tool collecting for personal use on open land.

Aquamarine, Beryl, Phenakite, Smoky Quartz

Gunnison County, Colorado

Italian Mountain holds one of the few genuine lapis lazuli localities in the United States, a contact-metamorphic deposit in marble that has produced some of the largest North American lapis specimens. Grossular garnet, diopside, pyrite, and calcite occur in the same skarn. The site sits on open Gunnison National Forest land outside designated wilderness.

Lapis Lazuli, Grossular Garnet, Diopside, Pyrite

Gunnison County, Colorado

The Quartz Creek, or Brown Derby, district is Colorado's most fractionated lithium-cesium-tantalum pegmatite field, mapped by the USGS as more than 1,800 pegmatite bodies. They carry beryl, lepidolite, pink and green tourmaline, and rare columbite-tantalite. The dikes sit on Gunnison National Forest land where personal hobby collecting with hand tools is allowed.

Beryl, Tourmaline, Lepidolite, Albite

Larimer County, Colorado

The Crystal Mountain pegmatite district, mapped in USGS Bulletin 1011, contains beryl in roughly a quarter of its pegmatites, including aquamarine, alongside muscovite, fluorapatite, and bismutite. The district sits on Roosevelt National Forest along upper Buckhorn Creek west of Fort Collins. Garnet and schorl tourmaline occur in the zoned pegmatites.

Beryl, Aquamarine, Fluorapatite, Muscovite

Mineral County, Colorado

Wolf Creek Pass cuts through Conejos Formation basalts whose gas cavities are lined with zeolites, including mordenite reported among the finest in North America, alongside amethyst-bearing geodes. Heulandite, chabazite, and calcite occur in the same amygdules. The collecting exposures along US 160 sit on San Juan and Rio Grande National Forest land outside designated wilderness.

Amethyst, Mordenite, Heulandite, Chabazite

South Central Connecticut Planning Region, Connecticut

The Guilford and East Haven shoreline yields water-worn agate, jasper, and quartz pebbles carried in as glacial erratics and reworked by Long Island Sound, a long-documented occurrence in Connecticut locality guides. Chaffinch Island Park in Guilford is the most openly accessible point, a free town park with a rocky tidal shorefront. Finds are small tumbled beach stones rather than outcrop material, best after storms at low tide.

Agate

South Central Connecticut Planning Region, Connecticut

Hubbard Park spans roughly 1,800 acres on the Talcott Basalt of the Hanging Hills, the traprock ridge that gives central Connecticut its classic quartz and zeolite pockets. Vesicular basalt along the road cuts and ridge exposes drusy quartz, amethystine quartz, and cavity linings of stilbite, natrolite, and datolite. It is the most freely accessible traprock locality in the state, with Castle Craig and miles of trails open to the public year round.

Quartz

Lower Connecticut River Valley Planning Region, Connecticut

Plum Bank Beach is one of Connecticut's more reliable shoreline spots for surface agate and moonstone, tumbled from glacial outwash and concentrated in the beach gravel by Long Island Sound tides. The Laurentide ice sheet left the material as lag deposits, so the best picking follows low tide and storms rather than any bedrock exposure. It is casual beachcombing, not digging: finds run from pea to walnut sized chalcedony and adularescent feldspar.

Agate, Moonstone

Carroll County, Georgia

The gravels of the Little Tallapoosa River near Carrollton carry small rubies and garnets shed from nearby vein exposures, with garnet and olivine also reported in outcrops just off GA 166. The corundum is found about a mile or so east of town in the river gravels. It is one of the more accessible ruby-bearing localities in west Georgia.

Ruby

Fannin County, Georgia

The Mineral Bluff area of Fannin County is the classic source for staurolite "fairy crosses," the twinned crystals that are Georgia's state mineral. The crystals weather out of mica schist and accumulate in residual soil, where the dark twins stand out against the red clay, especially after rain. The right-angle (90-degree) twins are the prized form and are scarcer than the more common 60-degree crosses.

Staurolite

Habersham County, Georgia

Habersham County lies along a kyanite-mica schist belt roughly 30 miles long, and the Soquee (Soque) River drainage near Clarkesville is a recognized source of bladed blue kyanite. The mineral weathers out of the schist and collects in the river gravels and float. The same belt extends into neighboring Rabun County, making this one of Georgia's principal kyanite regions.

Kyanite

Lumpkin County, Georgia

Baggs Branch sits in the Dahlonega gold belt of Lumpkin County, the district that touched off the 1829 Georgia gold rush and yielded an estimated 400,000 to 500,000 ounces. Fine placer gold occurs in the gravels of the small Chattahoochee and Etowah tributary streams that drain the belt. Hand panning these streambeds is the traditional recreational method here.

Gold

Towns County, Georgia

Towns County, in the far northeastern mountains, is one of Georgia's better-known sources of gem-quality amethyst, documented at several localities including the Garrett Mine near Titus. The purple quartz occurs in quartz veins and weathers loose into the surrounding soil and stream gravels. The surrounding Blue Ridge schists and pegmatites also yield clear and smoky quartz.

Amethyst

Muscogee County, Georgia

Where the Chattahoochee River crosses the Fall Line at Columbus, its gravels carry a varied suite of silica minerals: chalcedony, chert, flint, jasper, opal, and opalized wood. The material washes down from the Coastal Plain formations and concentrates on bars and in the river's gravel. It is one of the few signature collecting opportunities reachable from a major Georgia city.

Chalcedony, Chert, Flint, Jasper

Burke County, Georgia

The Girard area produces "Savannah River agate," a banded mix of agate, jasper, chert, and opalite that forms in the Coastal Plain near the Burke and Screven county line. The material tumbles and cabs into colorful pieces ranging from brown mottled stone to soft greens, yellows, and violets. The host Oligocene-age deposits also carry marine fossils alongside the chalcedony.

Savannah River Agate, Chalcedony, Quartz, Silicified Oolite

Elbert County, Georgia

The Elberton district of Elbert County is a long-documented pegmatite area that has produced aquamarine beryl, including masses up to several inches across, along with quartz, garnet, and tourmaline. The aquamarine is characteristically fractured by regional stress, with the breaks healed by tiny later beryl crystals. Cook's "Minerals of Georgia" records the Harmony Church pegmatite among the aquamarine sources here.

Aquamarine, Garnet, Quartz, Tourmaline

Dodge County, Georgia

Dodge County is the heart of the georgiaite strewn field, the source of most of the roughly 1,700 to 2,000 tektites recovered in Georgia. Georgiaites are a rare olive-green natural glass tied to a Late Eocene impact, and Dodge and neighboring Bleckley counties account for the bulk of finds. New specimens still turn up, including one recovered in 2017.

Tektites

Lowndes County, Georgia

The Withlacoochee River near the Florida line is one of the best remaining places in Georgia to find agatized coral, fossil coral colonies replaced by chalcedony. The material derives from the Oligocene Suwannee Limestone and is recovered from the riverbed and bank gravels of Lowndes County. With many Florida coral sites now closed, this stretch is a regionally significant locality.

Agatized Coral

Shoshone County, Idaho

Emerald Creek is Idaho's signature public star-garnet locality, with the Forest Service noting that commercial quantities of star garnet are otherwise known only from India. The managed sluice area gives collectors a rare legal way to search for dodecahedral almandine garnets while keeping digging out of the streambed.

Almandine Garnet

Boise County, Idaho

Idaho City anchors the Boise Basin, one of Idaho's best-documented historic placer-gold regions. USGS publications identify the basin northeast of Boise as a major dredging and placer area, and nearby Grimes Pass district records add quartz and gold mineral context for modern, land-status-aware panning and prospecting.

Quartz, Garnet

Owyhee County, Idaho

Bruneau Canyon stands out for Bruneau jasper, the orbicular and scenic jasper variety tied to the Bruneau River canyon in Owyhee County. Idaho Department of Lands lists Bruneau jasper about 50 road miles south of Bruneau, and Mindat treats the canyon deposits as a named locality, making it one of the state's most recognizable lapidary sources.

Bruneau Canyon Jasper

Adams County, Idaho

Seven Devils is a classic Idaho skarn and copper district, where Idaho Geological Survey maps and reports emphasize limestone-garnet belts, copper deposits, and lime-silicate minerals. For collectors, that translates into a broader mineral suite than most Idaho sites: garnet, epidote, malachite, zoisite, and related contact-metamorphic material.

Epidote, Red Garnet, Pink Garnet, Malachite

Custer County, Idaho

Challis represents the Challis Volcanics better than a single protected petrified-forest stop, with Idaho Department of Lands listing nearby red agate, banded opal, and petrified-wood localities in Custer County. Mindat records opal from the Challis area and documents agate collecting in the same volcanic province, which makes it a practical tenth pick for silica collectors.

Red Agate, Banded Opal

Elmore County, Idaho

Dismal Swamp is a focused Elmore County locality for smoky quartz and topaz, both listed for the area by Idaho Department of Lands and Mindat. It is a more mineral-specimen-oriented choice than many Idaho agate fields, with quartz-family collecting tied to the Rocky Bar mining district and nearby granitic terrain.

Smoky Quartz, Topaz

Owyhee County, Idaho

Succor Creek is one of the clearest public names in Owyhee agate collecting, especially for red-and-green nodules and thunderegg-style cavities. Idaho Department of Lands calls out the eastern fringe of Succor Creek specifically, and the broader Owyhee volcanic field gives the site the silica-rich source rocks behind its agate and jasper float.

Red Agate, Green Agate

Custer County, Idaho

Mackay is the best Custer County mine-district pick for copper minerals, with Mindat documenting malachite and related species across the Alder Creek and White Knob district. Idaho Department of Lands also lists Custer County districts for azurite, malachite, and other base-metal minerals, so the site has stronger mineral documentation than a generic scenic stop.

Azurite, Chalcopyrite, Chrysocolla, Malachite

Blaine County, Idaho

Little Wood River is the strongest Blaine County pick because the same drainage is listed for green and moss agate by Idaho Department of Lands and has Mindat specimen records from the Little Wood Reservoir area. Its agate, chalcedony, and jasper add a useful south-central Idaho counterpoint to the better-known Owyhee localities.

Agate, Chalcedony, Jasper

Lemhi County, Idaho

Parker Mountain gives Lemhi County a documented agate and chalcedony locality outside the crowded southern Idaho fields. Idaho Department of Lands lists green and green-moss agate near Parker Mountain, while Mindat records agate and chalcedony within the Parker Mountain mining district mineral list.

Agate, Chalcedony

Story County, Iowa

Central Iowa lies under the Des Moines Lobe, the last glacier to cross the state, and its drift is salted with Lake Superior agate, chalcedony, and jasper carried south from the Superior basin. Around Ames these show up in Skunk River gravels and glacial gravel exposures, along with reworked Pennsylvanian and Mississippian fossils. The Iowa Geological Survey points to central-Iowa gravel as dependable agate ground.

Chalcedony, Fossils

Hamilton County, Iowa

Bells Mill Park preserves outcrops along the Boone River where dark, well-formed calcite crystals occur in the Mississippian carbonates, an unusual and distinctive Iowa mineral locality. Unlike the state's ubiquitous glacial agate, this is a bedrock mineral occurrence tied to one specific valley. The park's river frontage keeps loose material replenished in the Boone River gravels.

Calcite

Black Hawk County, Iowa

The Cedar River valley through Black Hawk County is the home ground of the Iowa coldwater agate, a pale blue-gray to cream banded agate weathered from Devonian limestone and reworked into the river gravels. It occurs alongside true Lake Superior agates carried in by glaciers, giving the local bars two distinct agate types. The Cedar River constantly refreshes its gravel, so productive ground shifts with each season.

Coldwater Agate

Hardin County, Iowa

The Iowa River around Steamboat Rock cuts through glacial drift and Mississippian bedrock, concentrating agate, chalcedony, and clear to smoky quartz in its gravel bars. Mindat records calcite, quartz, and chalcedony from the Steamboat Rock area, and historic accounts note fine placer gold in the river sands. The sandstone bluff that gives the town its name marks the collecting reach.

Geode

Jackson County, Iowa

The Mississippi River gravel bars near Bellevue are one of Iowa's most productive Lake Superior agate grounds, working glacial drift that the river continually reworks and sorts. Collectors turn up banded and moss agates alongside carnelian, jasper, feldspar moonstone, and petrified coral. The stretch below Lock and Dam 12 exposes fresh gravel after every high-water event.

Lake Superior Agate, Moss Agate, Carnelian, Moonstone

Des Moines County, Iowa

Burlington marks the transition between Iowa's two great rockhounding stories: the Keokuk geode belt to the south and the Lake Superior agate fields carried in by glaciers. Mississippi River gravel bars here concentrate banded Lake Superior agates and quartz alongside the occasional geode weathered from nearby Mississippian limestone. The mix of glacial and bedrock material makes a single gravel bar unusually varied.

Lake Superior Agate, Quartz, Geode

Henry County, Iowa

Lowell sits in the heart of the Keokuk geode district, where the Mississippian Warsaw Formation sheds hollow, quartz-lined geodes into the Skunk River and its tributary creeks. The geode is Iowa's state rock, and this corner of Henry County is its type region, producing crystal-lined cavities of quartz and calcite with occasional pyrite, marcasite, and goethite. Fresh geodes weather steadily out of the gray Warsaw shales into the creek gravels.

Keokuk Geode

Linn County, Iowa

The Cedar River gravels around Cedar Rapids carry silicified Devonian coral weathered out of the Cedar Valley Group limestones that underlie eastern Iowa. Colonial corals such as Hexagonaria and Favosites survive as hard, silica-replaced heads that take a good polish. The same gravels yield glacial agates and jaspers, making this a productive mixed-bag stretch.

Silicified Coral, Calcified Coral

Louisa County, Iowa

The stream gravels around Muscatine and neighboring Louisa County are named by the Iowa Geological Survey as a reliable source of Lake Superior agate, moss agate, chalcedony, and clear quartz. The material is glacial float, carried south from the Superior basin and concentrated where creeks cut through the drift. Muscatine's Mississippi River terraces add a second gravel source close at hand.

Lake Superior Agate, Moss Agate, Chalcedony, Quartz

Van Buren County, Iowa

Bentonsport, a preserved 19th-century village on the Des Moines River, lies within the same lower Warsaw geode horizon that defines southeast Iowa. Tributary creeks cut the geode-bearing shales and drop quartz-lined geodes and silicified Mississippian coral into the river gravels. The stretch of the Des Moines River between Bentonsport and Farmington is a classic float-and-collect corridor.

Keokuk Geode

Hancock County, Maine

Catherine Mountain holds a nineteenth-century molybdenite prospect where molybdenite occurs in granite pegmatite, rare vugs, and fractures, alongside reported scheelite and wolframite. The peak sits inside the state-administered Donnell Pond Public Reserved Land, where the Maine Geological Survey allows casual hobby collecting without a permit.

Molybdenite, Scheelite, Fluorapatite, Magnetite

Lincoln County, Maine

The Edgecomb pegmatite pits sit inside the 766-acre Schmid Preserve, town land laced with more than seven miles of public trails, where 1880s feldspar and mica workings exposed almandine garnet, beryl, and aquamarine. The preserve is free and open to the public. Smoky quartz and muscovite occur in the same pegmatite.

Almandine Garnet, Beryl, Aquamarine, Smoky Quartz

Oxford County, Maine

The Swift River at Coos Canyon in Byron carries fine glacial gold and is the most famous recreational gold-panning spot in New England, with flakes recoverable from bedrock crevices in the roadside gorge. Nine acres of the canyon were permanently protected through Maine's Land for Maine's Future program in 2006. Garnet and magnetite concentrate in the same black sand.

Gold, Garnet, Magnetite, Staurolite

Oxford County, Maine

Deer Hill is a US Forest Service designated mineral collecting area in the White Mountain National Forest, known for amethyst recovered by screening the sandy soil. Feldspar, beryl, garnet, columbite, and pyrite are also documented at the site. Hobby collecting is allowed under a no-fee day permit.

Amethyst, Beryl, Feldspar, Garnet

Oxford County, Maine

Lord Hill is a granite pegmatite in the White Mountain National Forest where more than 50 minerals have been recorded, most famously large white topaz and smoky quartz crystals encrusted with rare phenakite. The US Forest Service runs it as a designated collecting area open under a no-fee day permit. Feldspar and garnet round out the finds.

Topaz, Phenakite, Smoky Quartz, Feldspar

Androscoggin County, Maine

Mount Apatite is a lithium-rich pegmatite district where the Pulsifer Quarry produced some of the finest purple apatite crystals in the world, alongside green and pink tourmaline, aquamarine, and lilac lepidolite. The historic feldspar quarries now sit inside Auburn city parkland, making this one of the few Maine gem localities with genuine free public access. Garnet and smoky quartz turn up in the same dumps.

Green Tourmaline, Pink Tourmaline, Aquamarine, Purple Apatite

Lancaster County, Pennsylvania

This Fulton Township locality sits in the State Line serpentine district and is famed for williamsite, the translucent green gem serpentine prized by Pennsylvania collectors, together with kammererite, chromite, brucite and soapstone. Few places in the East produce williamsite of this quality. It is a signature Piedmont serpentine spot.

Kammererite, Serpentine, Soapstone, Williamsite

Keweenaw County, Michigan

The exposed Lake Shore Traps along the wave-washed tip of the Keweenaw Peninsula carry agate-filled amygdules and datolite, with larger Keweenaw agates working loose from a narrow gravel band at the waterline. The State of Michigan and The Nature Conservancy secured public access to roughly 6,275 acres here in 2003, keeping the Point open for shoreline collecting. Thomsonite and chalcedony round out the finds.

Keweenaw Agate, Thomsonite, Datolite, Chalcedony

Ontonagon County, Michigan

The Lake Superior shoreline around Ontonagon is among the most agate-rich in Michigan, with the stretch toward Copper Harbor noted for unusually heavy agate cover along with quartz, jasper, and occasional copper. Public township and roadside beaches give free access to the wave-sorted gravel where Keweenaw agates and thomsonite turn up. The best searching follows a storm that reworks the gravel.

Keweenaw Agate, Thomsonite, Chalcedony, Jasper

Keweenaw County, Michigan

The 93-acre Manitou Island Light Station Preserve, owned by the Keweenaw Land Trust off the tip of the Keweenaw, is one of the few outer-island shores expressly open to the public for rock collecting. Its rocky Lake Superior shoreline yields Lake Superior agates and includes a visible quartz vein. The land trust acquired the preserve from the federal government in 2004.

Lake Superior Agate, Quartz

Marquette County, Michigan

Jasper Knob in Ishpeming is a bald hilltop made entirely of jaspilite, a 1.87-billion-year-old banded iron formation of alternating red jasper and silvery specular hematite. The folded, polished bands are among the best easily reached banded-iron exposures in North America. A short foot trail off Hill Street leads straight to the outcrop.

Jaspilite, Jasper, Hematite, Specular Hematite

Emmet County, Michigan

Little Traverse Bay in Emmet County is the most reliable place in Michigan to find Petoskey stones, the state stone, which are fossilized Hexagonaria colonial coral that show their honeycomb pattern best when wet. Petoskey State Park offers about a mile of sand-and-rock Lake Michigan shoreline, and nearby Magnus City Park adds a free-parking beach within walking distance of downtown. Charlevoix stones and other Devonian fossils turn up in the same gravel.

Petoskey Stones

Oceana County, Michigan

Charles Mears State Park puts almost 2,000 feet of Lake Michigan beach within easy reach in Pentwater, where wave-sorted gravel turns up Petoskey stones and other glacially transported Great Lakes specimens. The shoreline below the ordinary high-water mark is public land, so beachcombing is broadly allowed along the water's edge. It is one of the more accessible west-coast beaches for casual collectors.

Petoskey Stones, Agate, Fossils

Presque Isle County, Michigan

The Presque Isle peninsula on Lake Huron is documented for an unusual mix of agate, chalcedony geodes, and brown sandstone veined with calcite, finds that gather along its rocky shoreline after summer storms. The beach below the ordinary high-water mark is public land, giving collectors legal footing along the water's edge. Petoskey stones and jasper occur in the same gravel.

Agate, Chalcedony Geode, Sandstone With Calcite Veins

Alpena County, Michigan

Rockport State Recreation Area opens a 300-acre former limestone quarry whose floor is scattered with Devonian fossils about 400 million years old, including Petoskey stones, Favosites honeycomb coral, brachiopods, and crinoids. It is one of the few Michigan state sites where the DNR openly invites visitors to keep up to 25 pounds of fossils per person each year. Pyrite also occurs in the quarry beds.

Petoskey Stones, Fossilized Coral, Brachiopods, Crinoid Stems

Carlton County, Minnesota

Carlton County is the heart of Minnesota's inland agate country: glaciers dragged Lake Superior agate south and dumped it in the region's thick gravel deposits, and the nearby Moose Lake area is billed as the Agate Capital of the World. Agate turns up in the county's gravel pits, gravel roads, and river cuts around Cloquet rather than on a single outcrop. Carlton County runs a formal agate-picking permit program that opens designated county pits to collectors.

Lake Superior Agate, Garnet, Greenalite, Magnetite

Cook County, Minnesota

The Cook County shore around Grand Marais holds Minnesota's best thomsonite, a zeolite that filled gas cavities in the billion-year-old North Shore basalt flows and weathers out as rounded nodules with concentric green, pink, and white eyes. Good Harbor Bay is the most productive public thomsonite beach in the state, and the same lava flows yield lintonite, a green massive variety, alongside Lake Superior agate. Collecting is best after storms, when wave action turns fresh gravel onto the beach.

Lintonite, Thomsonite

Lake County, Minnesota

Beaver Bay sits on a stretch of North Shore where both Lake Superior agate and thomsonite wash into the beach gravel, a combination that has made it a long-standing favorite among Minnesota collectors. The surrounding basalt flows are part of the same billion-year-old rift volcanics that produced the state's agates and zeolites. Public shoreline access near the town lets collectors work the gravel after each storm.

Lake Superior Agate, Thomsonite

Saint Louis County, Minnesota

The bedrock around Ely belongs to the Archean Ely Greenstone, some of the oldest rock in Minnesota at roughly 2.7 billion years, and its iron formations and quartz veins yield jasper, quartz, and chalcedony. Streams, road cuts, and old prospect dumps in the Vermilion district are the traditional collecting ground. Much of the surrounding land is Superior National Forest, where casual hand collecting for personal use is generally permitted.

Jasper, Quartz, Chalcedony

Saint Louis County, Minnesota

Hibbing sits on the Mesabi Range, where the 1.9-billion-year-old Biwabik Iron Formation exposes banded iron formation of alternating hematite, magnetite, and goethite layered with red and gray jasper. Road cuts and old workings across the range yield hand samples of jasper, banded iron, and glacially transported Lake Superior agate. The Hull Rust Mahoning overlook nearby shows the scale of the deposits that seed the surrounding gravels.

Iron, Agate, Jasper, Marcasite

Lake County, Minnesota

The cobble beaches at Knife River are one of the North Shore's most reliable places to hunt Lake Superior agate, Minnesota's state gemstone, formed roughly a billion years ago in the gas vesicles of Keweenawan basalt along the Midcontinent Rift. Storms sort the shoreline gravel and expose fresh material, and both the lakeshore and the lower Knife River banks produce banded agate. The Knife River Marina beach offers rare, dedicated public parking and access directly on Lake Superior.

Lake Superior Agate

Lake County, Minnesota

Kelsey Beach, the public cobble beach at the Stewart River mouth a few miles north of Two Harbors, sits in the North Shore agate belt where wave-sorted gravel yields Lake Superior agate along with basalt and jasper from the billion-year-old rift lava flows. Like the rest of the shore, it produces best after storms wash fresh cobbles onto the beach. A small highway pull-off and short foot paths give straightforward public access away from the busier marquee stops.

Lake Superior Agate

Morrison County, Minnesota

The Mississippi River gravels around Little Falls carry Lake Superior agate along with staurolite, the twinned fairy cross crystals that made the area locally famous. The best-known staurolite ground is the shoreline below Blanchard Dam south of town, one of the few places in the world where the crosses can be surface-collected. Morrison County's glacial gravel pits also produce agate, quartz, and jasper.

Lake Superior Agate, Garnet, Staurolite

Olmsted County, Minnesota

The Rochester area combines two southeastern Minnesota draws: Lake Superior agate scattered through the glacial and river gravels, and Ordovician marine fossils weathering out of the region's roughly 450-million-year-old limestone and shale. Trilobites, cephalopods, brachiopods, and crinoids record the shallow tropical sea that once covered the state. Creek cuts, road exposures, and gravel deposits are the usual hunting ground.

Lake Superior Agate, Chalcedony, Fossils

Goodhue County, Minnesota

Red Wing anchors the southeastern reach of Minnesota's Lake Superior agate range: glaciers and the Mississippi River spread agate-bearing gravel far south of the stone's North Shore origin. Collectors work the gravelly bars, banks, and river-mouth deposits along the Mississippi for banded agate, and the region's Paleozoic bluffs add fossil interest. The stones here are the same billion-year-old rift agates found up north, redeposited by ice and water.

Lake Superior Agate

Daviess County, Missouri

Gallatin sits on the Grand River in glaciated Daviess County, and the river gravels here are a documented source of petrified wood, agate, jasper, and chalcedony reworked from glacial drift. It gives collectors a defined river-access point within the broader northwestern Missouri agate country. Petrified wood is the standout find, with pieces showing clear cell structure.

Agate, Chalcedony, Jasper, Petrified Wood

Gentry County, Missouri

Gentry County in far northwestern Missouri lies squarely in glacial-drift country, where ice-rafted Lake Superior agates, jasper, and petrified wood are scattered through till and reworked into the area's stream gravels. It is one of the recognized northwest Missouri counties for agate hunting, alongside Daviess, Grundy, and Livingston. The agates carry the classic red-and-white fortification banding of the Lake Superior type.

Lake Superior Agate, Jasper, Fossils, Petrified Wood

Daviess County, Missouri

Daviess County lies in the glaciated plains of northern Missouri, where Pleistocene ice sheets carried Lake Superior agates south from the Great Lakes basin and dropped them in glacial drift and stream gravels. Collectors work the area's creeks and the Grand River gravels for banded fortification agate, jasper, petrified wood, and fossils. The agates are tumble-rounded and frost-pitted, distinct from the local sedimentary chert.

Lake Superior Agate, Jasper, Fossils, Petrified Wood

Grundy County, Missouri

Grundy County rounds out the cluster of glaciated northern Missouri counties that yield ice-transported Lake Superior agates, with mindat documenting Lake Superior agate from the county. Its creeks and the Thompson and Weldon river gravels rework glacial drift, freeing agate, jasper, and petrified wood. The material is the same banded, tumble-rounded agate prized by Midwest collectors.

Lake Superior Agate, Jasper, Fossils, Petrified Wood

Clark County, Missouri

Clark County is the most productive geode-collecting county in Missouri, sitting at the southwestern edge of the famous Keokuk geode district along the Des Moines and Mississippi drainages. Geodes weather out of the lower Warsaw Formation, a soft shaley limestone, and concentrate in creek and river gravels with quartz, calcite, and sulfide linings. The Alexandria and Wayland area near the Des Moines River mouth has long been a classic source.

Geode

Lewis County, Missouri

The Fabius River drainage in Lewis County cuts through the Warsaw Formation on the southern margin of the Keokuk geode belt, releasing geodes lined with quartz, calcite, aragonite, and trace sulfides into the river gravels. It extends the famous Clark County geode beds a county south and gives collectors a second, less-crowded drainage to work. Geodes here range from golf-ball size to grapefruit size.

Geode, Calcite, Malachite, Pyrite

Lewis County, Missouri

The Mississippi River gravels around La Grange in Lewis County carry gem-quality agate, chalcedony, jasper, petrified wood, and the occasional Keokuk geode, all concentrated by the river and reworked glacial drift. Older accounts of Missouri minerals single out the large gravel deposits near La Grange as a source of beautiful agate specimens. The mix of Lake Superior agate carried south by glaciers and local silica makes the river bars unusually varied.

Agate, Chalcedony, Jasper

Benton County, Missouri

Lincoln sits at the heart of the mozarkite country in Benton County, the source of Missouri's official state rock, a multicolored gem chert that weathers out of the Mississippian Burlington and Warsaw limestones. Freshly broken cobbles show red, pink, purple, and green banding against gray, and the town hosts an annual mozarkite festival built around the material. It is one of the few places in the country where this specific gem chert occurs in collectible quantity.

Chalcedony, Chert, Mozarkite, Galena

Benton County, Missouri

Warsaw anchors the southern end of the Benton County mozarkite belt and sits on the Harry S. Truman Reservoir, where falling lake levels expose chert and mozarkite cobbles along the shoreline. The same Burlington and Warsaw limestone weathering that supplies Lincoln also feeds gravels and lakeshores around Warsaw, yielding banded gem chert plus agate and ordinary chert. It is a second strong access point for the state rock, with miles of public shoreline to walk.

Agate, Chert, Mozarkite

McDonald County, Missouri

The Elk River in McDonald County is a clear, floatable Ozark stream whose gravel bars are packed with colorful Mississippian chert, including the locally prized blue and gray banded chert weathered from the surrounding Boone Formation. The river runs through Pineville and Noel with numerous public-access bars and ramps. It offers easy, family-friendly surface collecting away from the Tri-State mining district hazards.

Chert, Blue Chert

Beaverhead County, Montana

Calvert Hill Mine adds a tungsten-skarn flavor to the Montana list, with Mindat describing a surface mine in Cambrian Meagher Formation limestone and listing scheelite, garnet, beryl var. aquamarine, chalcopyrite, molybdenite, pyrite, and smoky quartz in the district. That mineral spread makes it a stronger educational pick than another agate bar from the same river system.

Scheelite, Garnet, Aquamarine, Tungsten

Granite County, Montana

Rock Creek is one of Montana's four classic sapphire districts, documented by USGS and GIA alongside the Missouri River, Dry Cottonwood Creek, and Yogo Gulch. Mindat records corundum, sapphire, ruby, garnet, hematite, kyanite, magnetite, and rutile from the district, giving the locality more mineral context than a simple gem-gravel stop.

Quartz, Sapphire

Madison County, Montana

Ruby River is Montana's clearest garnet-focused pick in this candidate set, with nearby Mindat records listing almandine and broader Madison County garnet occurrences. Its appeal is narrow but strong: a recognizable metamorphic and placer-derived garnet target in a state otherwise dominated in popular collecting by sapphire and agate.

Almandine Garnet

Deer Lodge County, Montana

Dry Cottonwood Creek is one of the historic Montana sapphire fields named by USGS and GIA, discovered after the Missouri River bars and before Rock Creek and Yogo Gulch. It is less accessible and less active than some better-known sapphire districts, but that documented place in the state's corundum history makes it too important to omit.

Sapphire

Ravalli County, Montana

Crystal Mountain Mine is a focused fluorite locality, with Mindat tying the Ravalli County site to the Crystal Mountain Fluorspar Mine and listing fluorite with quartz and accessory phosphate and silicate minerals nearby. The spot broadens Montana's top list beyond sapphire, agate, and historic base-metal districts with a clear single-mineral identity.

White Fluorite, Green Fluorite, Purple Fluorite

Silver Bow County, Montana

Butte is Montana's heavyweight ore-mineral locality, with MBMG and USGS work documenting complex copper, silver, manganese, and related vein mineralogy in the district. For collectors, the draw is not ordinary float but classic species tied to the Butte lodes, including bornite and rhodochrosite in a district with national-scale mining history.

Bornite, Pisanite, Rhodochrosite, Rhodonite

Big Horn County, Montana

The Pryor Mountains stand out for Dryhead-style agate, with Mindat listing agate and chalcedony from the range and a named Dryhead Agate Mine in the Bighorn River area. The same Big Horn County country also carries fossil-bearing sedimentary units, so the locality needs careful land-status and fossil-rule checks rather than casual blanket collecting.

Fossils, Agate, Chalcedony, Jasper

Lewis and Clark County, Montana

American Bar belongs to the upper Missouri River sapphire province, where GIA traces gem-quality sapphire mining back to 1865. The associated heavy-mineral suite, including cassiterite, garnet, kyanite, topaz, gold, and chalcedony, makes the Missouri River bars one of Montana's most mineralogically varied placer settings.

Sapphire, Cassiterite, Chalcedony, Garnet

Yellowstone County, Montana

The Billings reach of the Yellowstone River is a benchmark Montana agate setting, where river gravels carry chalcedony, jasper, chert, and dendritic moss agate. Mindat records agate from Yellowstone County, and regional visitor and BLM guidance both point collectors toward public-land surface collecting rather than quarry or fee-pit material.

Montana Agate, Chalcedony, Chert, Jasper

Dawson County, Montana

Glendive sits in eastern Montana's Yellowstone River agate belt, where gravel bars and nearby breaks are known for agate, jasper, and petrified-wood style silica material. The site earns its place because it represents the downstream end of the Montana agate story, where long river transport has already sorted and rounded much of the collectible material.

Agate, Jasper, Moss Opal

Humboldt County, Nevada

Virgin Valley is the United States' classic black-opal district, with USGS and Mindat both placing the opal field near the Oregon line in the Sheldon refuge country. Its strongest geologic feature is opal replacing mid-Miocene wood, including petrified wood and rare plant material, although most precious-opal ground is claimed and any collecting has to respect mining and refuge restrictions.

Agate, Chalcedony, Chert, Flint

Pershing County, Nevada

Black Rock Desert belongs on the list because the collecting context is an enormous BLM-managed volcanic and basin landscape rather than a single small pit. Local rockhounding guidance for Black Rock-High Rock country highlights minerals, common fossils, and petrified wood rules, while BLM documents the area's national conservation status and broad public-land recreation framework.

Opalized Wood, Petrified Wood, Agate, Fire Opal

White Pine County, Nevada

Garnet Hill is Nevada's clearest public rockhounding benchmark: BLM identifies it as the Ely District's designated rockhounding area, and Mindat ties the locality to almandine garnet in flow-banded rhyolite with lithophysae. The site stands out because its garnets are part of a documented volcanic setting, not an unnamed gravel patch, and access is organized around casual public collecting.

Garnet

Lyon County, Nevada

Fernley Hills is a practical western Nevada silica stop, with Mindat records documenting agate, chalcedony, opal, quartz, and zeolite minerals in the Fernley area. It earns a place because the material is tied to a named locality close to Reno-Sparks access, while still requiring parcel and claim checks before collecting.

Agate, Chert, Jasper

Pershing County, Nevada

Lincoln Hill is unusually specific for a lapidary locality: Mindat and cited NBMG work document pink to lavender dumortierite in felsitic trachyte breccia, with quartz, andalusite, corundum, ganterite, and tourmaline in the same deposit. That focused borosilicate assemblage makes it a stronger pick than a generic Pershing County mining-district listing.

Blue Dumortierite, Pink Dumortierite

Esmeralda County, Nevada

Coaldale is a useful Esmeralda County silica locality because the candidate data points to agate, chert, hyalite opal, jasper, and turquoise in a compact desert area. Mindat and NBMG district records help anchor the site in a named mining district, making it a better researched pick than a vague countywide agate listing.

Agate, Chert, Hyalite Opal, Jasper

Esmeralda County, Nevada

Fish Lake Valley is notable for hot-spring mercury mineralization rather than ordinary desert float, with Mindat records describing opalized and silicified rhyolite-hosted rock carrying cinnabar and opal. The locality is a good Nevada example of silica-rich alteration, but mercury minerals and old workings make conservative collecting and hand-sample handling important.

Cinnabar, Opalite

Esmeralda County, Nevada

Goldfield is one of Nevada's strongest mineralogical districts because Mindat documents a high-sulfidation quartz-alunite gold system with native gold, native silver, pyrite, alunite, tellurides, and several type-locality minerals. Its value for rockhounding research is the intensely altered volcanic-hosted setting, although the historic mine landscape demands careful attention to claims and mine hazards.

Alum, Pyrite, Quartz, Copper

Nye County, Nevada

The San Antonio Mountains add central Nevada range-scale diversity, with Mindat documenting a large Nye County assemblage that includes quartz, chalcedony, opal, fluorite, rhodochrosite, scheelite, sulfides, and several copper minerals. The dataset's jade, petrified wood, and wonderstone entry makes the area a lapidary contrast to nearby Tonopah and Goldfield metal districts, provided collecting stays on open public ground.

Jade, Petrified Wood, Wonderstone

Clark County, Nevada

White Basin stands apart from Nevada's silica and precious-metal localities because it is a borate occurrence, with Mindat listing ulexite, colemanite, gypsum, halite, and related evaporite minerals from the Muddy Mountains district. NBMG and USGS discussions of Muddy Mountains borates give the site a stronger geologic footing than a casual listing of 'TV rock.'

Ulexite

Monmouth County, New Jersey

Shark River is named for the fossil shark teeth found where it cuts middle Eocene marine beds, notably the Shark River and Manasquan formations, roughly 45 million years old. A basal quartz sand layer yields shark and ray teeth, while the glauconitic marl above carries molds of clams and other shells. It sits inside a Monmouth County park, so collecting is done through the park's programs or on the exposed gravel bars.

Shark Teeth, Fossils

Cape May County, New Jersey

Sunset Beach at the tip of Cape May is the classic place to hunt Cape May diamonds, rounded pure quartz pebbles that polish up like gemstones. The quartz travels roughly 200 miles down the Delaware River from veins in the upper watershed, arriving water-clear and wave-worn on the Delaware Bay shore. It is a free, beginner-friendly beach with easy pickings after storms.

Quartz, Chalcedony

Gloucester County, New Jersey

The Jean and Ric Edelman Fossil Park preserves a former marl quarry whose bone bed sits right at the 66-million-year-old end-Cretaceous extinction boundary. Its beds have produced more than 100,000 fossils across 100-plus species, including shark teeth, marine crocodiles, sea turtles, and mosasaurs. Run by Rowan University, it is the only active public community-dig fossil quarry east of the Mississippi.

Amber, Fossils

Cibola County, New Mexico

The Zuni Mountains give New Mexico's top ten a western forest-and-public-land agate field rather than another southern mining district. The candidate data's agate, chalcedony, jasper, and petrified wood suite aligns with New Mexico Bureau of Geology rockhound guidance and published Rockhounding New Mexico locality coverage for the Gallup, Grants, and Zuni Mountains region.

Agate, Chalcedony, Jasper, Petrified Wood

Taos County, New Mexico

Harding Pegmatite Mine is a preserved lithium-beryllium-tantalum pegmatite where UNM still allows small personal collecting under posted rules. New Mexico Geological Society and USGS-derived records document lepidolite, spodumene, beryl, microlite, apatite, muscovite, quartz, and related rare-element pegmatite minerals, making it the state's clearest public window into a classic complex pegmatite.

Blue Apatite, Bityite, Eucryptite, Purple Lepidolite

Sandoval County, New Mexico

The Jemez National Recreation Area sits in one of New Mexico's most visible volcanic landscapes, within the Santa Fe National Forest's Jemez Ranger District. Forest Service materials document the managed public recreation area, and the National Park Service notes obsidian deposits on the edge of Bandelier and elsewhere in the Jemez Mountains, making this a strong northern New Mexico volcanic-glass entry.

Obsidian, Opalized Wood

Santa Fe County, New Mexico

Mount Chalchihuitl is tied to the Cerrillos turquoise district, one of New Mexico's defining prehistoric and historic turquoise sources. Mindat records turquoise for the Chalchihuitl Mine, and Cerrillos Hills plus New Mexico Geological Society references describe the hill as an important early turquoise-mining locality rather than a generic Santa Fe gravel stop.

Agate, Chalcedony, Petrified Wood, Turquoise

Doña Ana County, New Mexico

Hatch is a useful southern New Mexico agate and jasper area because it represents the broad volcanic terrain around the Caballo and Hatch country, not a single pay-to-dig pit. BLM rules provide the public-land collecting framework, while New Mexico Bureau of Geology and established rockhounding guides list the area for agate, chalcedony, jasper, and quartz.

Agate, Chalcedony, Jasper, Quartz

Doña Ana County, New Mexico

Kilbourne Hole is a BLM-managed maar crater and National Natural Landmark where volcanic bombs can contain bright olivine-rich interiors. BLM, Recreation.gov, and New Mexico Bureau of Geology rockhound material all point to its mantle xenolith and peridot appeal, a very different target from the state's agate and jasper localities.

Augite, Peridot

Grant County, New Mexico

Redrock stands out for ricolite, the banded nonfibrous serpentine associated with the Ricolite district in the Burro Mountains. Mindat ties the Ash Creek Canyon quarry to the Ricolite district, and New Mexico Bureau of Geology industrial-minerals notes distinguish decorative ricolite from the state's minor asbestos occurrences.

Ricolite, Banded Serpentine

Luna County, New Mexico

Rockhound State Park is unusual because it was set aside specifically for personal mineral collecting, with state-park rules allowing visitors to keep a limited amount of material. Recreation.gov, New Mexico State Parks, and the New Mexico Bureau of Geology describe its Little Florida Mountains setting and collectible jasper, agate, chalcedony, quartz, geodes, and thunderegg-style nodules.

Agate, Blue Chalcedony, Jasper

Socorro County, New Mexico

Kelly is a benchmark locality for blue smithsonite from the Magdalena mining district, with Mindat rating the species occurrence as world-class or very significant. USGS Professional Paper 200 anchors the district geology, while New Mexico Tourism documents the surviving ghost-town and headframe setting that makes the mineral locality recognizable on the ground.

Smithsonite, Zinc, Fossils

De Baca County, New Mexico

Fort Sumner represents the Pecos diamond belt, where the collectible material is doubly terminated authigenic quartz rather than true diamond. New Mexico Bureau of Geology publications tie these quartz and occasional dolomite crystals to Seven Rivers Formation and related Artesia Group outcrops, and Mindat records the De Baca County occurrence as a named Pecos diamond locality.

Quartz, Pecos Diamonds

Orange County, New York

Amity is a classic Orange County contact-metamorphic locality where blue and white corundum, spinel, and fluorite occur in the crystalline limestone belt. It is one of the oldest documented mineral collecting spots in the state and still produces gem-species corundum.

Blue Corundum, White Corundum, Fluorite

Essex County, New York

Crown Point produces the iridescent Adirondack feldspar known as sunstone, along with labradorite, in the anorthosite and gneiss of eastern Essex County. The flash and quality of the feldspar make it a standout Lake Champlain-area collecting spot.

Sunstone

Essex County, New York

Mill Pond is a well-known Essex County source of massive rose quartz weathering out of Adirondack pegmatite. Loose, richly colored pieces can be surface-collected, making it one of the more accessible Adirondack quartz sites.

Rose Quartz

Montgomery County, New York

The Sprakers roadcuts and quarry ground expose the same Little Falls Dolostone that hosts Herkimer diamonds, and the site is a long-known free alternative to the fee mines for finding doubly-terminated quartz. Weathered pockets here release loose crystals with minimal breaking.

Herkimer Diamond, Quartz

Warren County, New York

Gore Mountain is the classic Adirondack almandine garnet locality, source of the enormous dark-red garnet porphyroblasts that made Warren County world-famous and supplied the abrasive industry for a century. The metamorphic host rock yields well-formed garnet crystals larger than most sites can offer.

Almandine, Garnet

Herkimer County, New York

The Ace of Diamonds and neighboring Herkimer Diamond Mine sit on the Cambrian Little Falls Dolostone, the type ground for the doubly-terminated clear quartz crystals known worldwide as Herkimer diamonds. It is the single most famous rockhounding destination in New York, with productive vug-lined dolostone that reliably yields loose, water-clear crystals.

Herkimer Diamond

Saint Lawrence County, New York

Balmat anchors the Balmat-Edwards zinc district, a world-class metamorphosed carbonate terrane famous for fine tremolite, talc, anthophyllite, and associated sulfides. The dumps and exposures offer a rare chance at museum-grade metamorphic minerals in St. Lawrence County.

Anthophyllite, Apatite, Talc, Tremolite

Saint Lawrence County, New York

Edwards is a core locality of the Balmat-Edwards zinc belt, yielding sphalerite, galena, gypsum, and purple fluorite from the same metamorphosed marble that made the district internationally known. It is a reliable source of well-crystallized sulfides and fluorite.

Barite, Galena, Gypsum, Sphalerite

Saint Lawrence County, New York

Fowler is a St. Lawrence County locality noted for barite and hematite geodes in the metamorphosed carbonate terrane, offering collectors crystal-lined pockets uncommon elsewhere in the region. It rounds out the northern New York district with a distinctive geode target.

Geode, Hematite, Barite

Niagara County, New York

Lockport is the type area for the Lockport Dolostone, whose vugs and cavities host classic New York fluorite along with celestite, calcite, and dolomite crystals. Roadcuts and quarry exposures along the Niagara Escarpment make it a signature western New York locality.

Fluorite

Madison County, North Carolina

Little Pine is a focused almandine locality where Mindat records red garnets up to 6 inches in green chlorite schist, a scale that separates it from ordinary garnet-bearing roadcuts. NCGS collecting-site references and later geologic work tie the mine to unusual Mg- and Al-rich schists in the western Blue Ridge.

Garnet, Quartz, Chlorite

Burke County, North Carolina

Linville Mountain is a useful Burke County contrast because NCGS collecting-site maps call out itacolumite, a flexible quartzite, along with pyrophyllite and related metamorphic minerals. The site is less about gemstones and more about unusual Blue Ridge rock types exposed near public mountain roads.

Actinolite, Graphite, Manaccanite, Pyrophyllite

Cherokee County, North Carolina

Vengeance Creek is one of the better free Cherokee County entries for staurolite, with garnet, quartz, and calcite adding a compact metamorphic suite. It earns a place because the locality sits in the Nantahala National Forest collecting framework, where limited surface collecting is possible outside closed or sensitive areas.

Calcite, Garnet, Quartz, Staurolite

Cherokee County, North Carolina

The Little Snowbird Mountains add chloritoid, ottrelite, staurolite, garnet, and gold to the western North Carolina set, a distinctly metamorphic association rather than another pegmatite stop. NCGS gold and collecting-site references place Cherokee County in the state's historic western gold and staurolite country, while National Forest rules provide the public-access framework.

Chloritoid, Ottrelite, Garnet, Gold

Clay County, North Carolina

Chunky Gal Mountain stands out because the Buck Creek dunite body is a named mafic-ultramafic complex, not just a generic mountain roadcut. Historic Bureau of Mines work describes the Buck Creek corundum area as one of North Carolina's important corundum settings, and the public National Forest approach keeps it relevant for careful surface collecting.

Garnet, Staurolite

Morrow County, Oregon

Opal Butte is noted for hyalite and several gem opal varieties, including rainbow, contra luz, hydrophane, crystal, fire, and blue opal. That range, documented in gemological literature and Mindat locality records, makes the permission-required Morrow County site one of Oregon's more distinctive opal occurrences.

Hyalite Opal

Harney County, Oregon

The high desert around Warm Springs Reservoir, on the Malheur River southeast of Burns, exposes weathered volcanic ground that yields agate, jasper, and petrified wood across public BLM land. Collectors find white, gray, and mossy agates alongside red and yellow jasper on the surface, with quality improving on the more remote ground away from the main roads. The reservoir lies in the broader Harney Basin rockhounding country that has drawn collectors to eastern Oregon for decades.

Agate, Chalcedony, Jasper, Petrified Wood

Malheur County, Oregon

Succor Creek is a remote canyon locality where Oregon State Parks identifies a haven for rock hounds and DOGAMI lists agate, jasper, and related chalcedony-family material from the area. Its standout quality is the combination of high-desert volcanic scenery and collectible silica materials, including jasper, chalcedony, chert, and opalized wood.

Agate, Chalcedony, Chert, Jasper

Crook County, Oregon

White Fir Spring is a public Ochoco National Forest thunderegg locality, with DOGAMI and Mindat records tying the site to agate- and jasper-filled nodules. It stands out because the Crook County material is strongly associated with jasper cores, a useful contrast to Oregon thunderegg beds dominated by clearer chalcedony.

Thundereggs

Crook County, Oregon

Whistler Spring is one of central Oregon's classic free National Forest thunderegg sites, listed by DOGAMI alongside White Fir in the Madras-Prineville rockhounding belt. The site is notable for accessible rhyolite-hosted nodules in Crook County's Ochoco country, a compact example of the geology behind Oregon's state rock.

Thundereggs

Lake County, Oregon

Glass Buttes is a rhyolite and obsidian complex with an unusually broad suite of gem-quality obsidian, including mahogany, rainbow, gold sheen, silver sheen, midnight lace, and other varieties documented by Oregon State University. The BLM-managed setting makes it one of Oregon's strongest public-land examples of volcanic glass collecting, with ordinary rockhounding rules still requiring attention to claims and local restrictions.

Obsidian

Lincoln County, Oregon

Agate Beach is named for the agates found along the Newport and Yaquina Head shoreline, and Oregon Sea Grant notes that winter storms expose the gravel beds that supply beach agates. The site stands out because Oregon ocean-shore rules allow small noncommercial collection of agates and other nonliving natural products, making the access as important as the material.

Agate, Moonstone, Jasper, Chalcedony

Lincoln County, Oregon

The Yachats beach area sits on Oregon's central coast, where storm-reworked gravel can expose agate, chalcedony, jasper, and related beach material. Its strength is broad legal ocean-shore access for small noncommercial collecting, paired with a shoreline that is repeatedly refreshed by Pacific winter wave action.

Agate, Chalcedony, Jasper, Moonstone

Macon County, North Carolina

Corundum Hill belongs to the Cowee Valley ruby and sapphire belt, one of the classic eastern U.S. corundum districts described in early USGS work. The appeal is specific rather than general: pink, blue, and green corundum occurs with chromite and olivine in a named Macon County ultramafic setting.

Corundum, Ruby, Blue Sapphire, Green Sapphire

Yancey County, North Carolina

Ray Mine gives North Carolina a rare free public pegmatite locality, with Mindat documenting aquamarine, beryl, amazonite, muscovite, rutile, tourmaline, and other Spruce Pine district minerals. Its strength is the combination of a historically worked mica mine and Forest Service surface-collecting access, provided current closures and mine hazards are respected.

Albite, Amazonite, Apatite, Aquamarine

Montgomery County, North Carolina

Eldorado is the Uwharrie-region gold and base-metal pick, tied to the Carolina Slate Belt rather than the Blue Ridge gem belts. Gold, pyrite, sphalerite, smithsonite, malachite, and azurite give the area a compact mining-district mineral suite, with public-land collecting rules requiring close attention to old workings and ownership.

Azurite, Calcite, Gold, Malachite

Stokes County, North Carolina

Danbury is the best northern Piedmont silica stop in this set, with agate, carnelian, chalcedony, jasper, hyalite opal, hematite, and amethyst listed from the Stokes County area. It broadens the North Carolina top 10 beyond mines and pegmatites by representing the Sauratown Mountains' smaller but distinctive lapidary material.

Agate, Carnelian, Chalcedony, Jasper

Vance County, North Carolina

Island Creek represents the Hamme tungsten district, where NCGS work identifies hubnerite-bearing veins with quartz, sericite, fluorite, and scheelite at the Tungsten Queen mine. That tungsten-fluorite-sulfide suite gives Vance County a very different collecting story from the Blue Ridge pegmatites and Macon County corundum fields.

Apatite, Chalcopyrite, Fluorite, Galena

Bedford County, Pennsylvania

Morrison Cove in Bedford County is a carbonate valley known for pockets of amethyst, clear and smoky quartz, and calcite in the surrounding folded Appalachian ridges. The area produces quartz crystals of surprising quality for central Pennsylvania. It is a standout collecting district in the ridge-and-valley belt.

Quartz, Amethyst, Calcite, Herkimer Diamond

Franklin County, Pennsylvania

The ridges of Michaux country around Caledonia in Franklin County shed agate and jasper into local streams and float, a byproduct of the region's iron-rich Blue Ridge geology. It offers scenic, forested collecting for colorful lapidary material. This is a well-loved south-central Pennsylvania hunting ground.

Agate, Jasper

Berks County, Pennsylvania

The Reading area of Berks County is the heart of Pennsylvania's historic jasper country, where prehistoric quarries supplied toolstone for thousands of years. Rich red and brown jasper still weathers out of the local ridges. Its combination of quality lapidary material and deep archaeological history makes it a distinctive locality.

Jasper

Chester County, Pennsylvania

The Brookdale Mine lies in the Phoenixville / Wheatley lead district, source of some of the finest pyromorphite specimens ever found in the United States. Green and brown pyromorphite occurs here alongside quartz, azurite, cerussite, fluorite and galena. This district is a genuine world-class Pennsylvania mineral locality.

Quartz, Pyromorphite, Azurite, Cerussite

Hunterdon County, New Jersey

The Delaware River gravel bars near Riegelsville carry a rounded mix of jasper, quartz, and chalcedony pebbles washed down from Appalachian and Piedmont bedrock upstream. This reach sits above the head of tide at Trenton, so the riverbed is non-tidal public water reachable from state boat-access points. It is a relaxed spot for surface pebble hunting when the river runs low.

Jasper, Quartz

Chester County, Pennsylvania

Nottingham County Park sits on the State Line serpentine barrens, one of the classic ultramafic exposures of the Pennsylvania Piedmont. Weathered serpentinite here yields serpentine, chromite, garnet, feldspar and tourmaline, and the barrens' distinctive flora makes it a well-documented geologic destination. It is an established, well mapped locality that stands out in eastern Pennsylvania.

Serpentine, Garnet, Feldspar, Tourmaline

Cumberland County, Pennsylvania

The Carlisle area of Cumberland County is known for banded agate, jasper, amethyst and quartz weathering out of the local carbonate and diabase terrain. The banded agate in particular draws collectors looking for lapidary-grade material. It is one of the better-known agate localities in south-central Pennsylvania.

Banded Agate, Quartz, Jasper, Amethyst

Delaware County, Pennsylvania

Chester Creek cuts through the same amethyst- and quartz-bearing Piedmont crystalline belt, and its gravels carry amethyst and smoky quartz weathered out of local veins and pegmatites. It offers easy, low-impact surface collecting close to the Philadelphia metro. A dependable creek spot for quartz-family material.

Amethyst, Smoky Quartz

Delaware County, Pennsylvania

Crum Creek drains the pegmatite-rich crystalline rocks of the Delaware County Piedmont, and its gravels concentrate golden beryl, amethyst, garnet and quartz eroded from those bodies. Stream collecting here needs no digging and rewards patient surface hunting. It is an accessible, productive creek locality near Philadelphia.

Golden Beryl, Amethyst, Garnet, Quartz

Lebanon County, Pennsylvania

Cornwall is one of the most famous iron deposits in eastern North America, a magnetite skarn worked for over two centuries. The contact-metamorphic assemblage produced a rich suite of andradite garnet, actinolite, calcite, chlorite, diopside, epidote and magnetite that is textbook Pennsylvania mineralogy. Its historical and mineralogical significance makes it a marquee locality.

Actinolite, Andradite, Calcite, Chlorite

Campbell County, South Dakota

The country around Mound City, west toward the Missouri River, is a documented source of petrified and agatized wood, with occasional opal, weathering out of the banks and gravels of the river and its tributaries. It is one of the better petrified-wood opportunities in the north-central part of the state.

Petrified Wood, Opal

Custer County, South Dakota

Tepee Canyon is the home of the distinctive Tepee Canyon banded agate, a fortification agate of purples, reds, and oranges encased in a chocolate-brown limestone host. The old commercial diggings off US-16 west of Custer are no longer open to mining claims, and rockhounds have productively worked the tailings here for decades. Agates here sit several feet inside the limestone and usually must be chipped free.

Agate, Beryl, Almandine Garnet, Lepidolite

Custer County, South Dakota

These are the classic Fairburn agate beds, the type locality for South Dakota's official state gem, sitting in the eroded badlands and surface gravels just east of the village of Fairburn. Fairburn agates are prized fortification agates that occur in nearly every color combination, and the same ground also yields agatized wood and yellow jasper. The hunting is surface picking, best after rain or snowmelt freshly exposes material.

Fairburn Agate, Agatized Wood, Yellow Jasper

Custer County, South Dakota

This locality along the Cheyenne River drainage sits within the core Fairburn agate belt just south of the main Fairburn beds, and the river gravels and surrounding badlands carry the same prized state-gem fortification agate. It offers another productive Fairburn-agate option in the Buffalo Gap grassland country.

Fairburn Agate

Fall River County, South Dakota

The badlands and surface gravels east and southeast of the near-ghost town of Ardmore are a well-documented Fairburn agate locality, producing Fairburn agate, agatized wood, jasper, chalcedony, and rose quartz. This is the southern end of the Fairburn agate belt that continues into the Nebraska grasslands, giving collectors a less-crowded alternative to the main Fairburn beds.

Fairburn Agate, Agatized Wood, Jasper, Chalcedony

Fall River County, South Dakota

The grassland south and east of Oelrichs is a long-recognized Fairburn agate area, also producing jasper, cone-in-cone calcite, and agatized wood. It sits in the same southwestern South Dakota agate belt as Fairburn and Ardmore, with badlands erosion continually exposing fresh material at the surface.

Fairburn Agate, Jasper, Calcite, Agatized Wood

Harding County, South Dakota

The far northwestern corner of South Dakota around Camp Crook produces prairie moss agate and chalcedony in the river gravels of the Little Missouri system, material comparable in style to the well-known Montana moss agate. This locality adds genuine geographic and material breadth well outside the Black Hills agate country.

Moss Agate, Chalcedony

Lawrence County, South Dakota

Lawrence County in the northern Black Hills is the best part of South Dakota for geodes, and the gravels in and around Spearfish Canyon yield baseball-sized geodes lined with amethyst, quartz, and chalcedony, plus silicified wood. The canyon is also one of the most scenic settings for rockhounding in the state.

Amethyst, Geode, Chalcedony, Silicified Wood

Lawrence County, South Dakota

The gravels of Whitewood Creek in the northern Black Hills are a reliable source of geodes lined with amethyst and chalcedony, along with silicified wood. Together with Spearfish Canyon it anchors Lawrence County's reputation as the best geode-hunting district in South Dakota.

Amethyst, Geode, Chalcedony, Silicified Wood

Walworth County, South Dakota

The Missouri River banks and gravels around Mobridge are one of the few South Dakota localities that produce opalized wood, a blend of petrified wood and silica or precious opal, along with agatized wood. It rounds out the list with a distinctive fossil-wood material from the central Missouri River corridor.

Opalized Wood, Agatized Wood

Decatur County, Tennessee

The Tennessee River is the home of the Tennessee River pearl, the official state gem, a natural freshwater pearl formed in the river's native mussels. Upstream on Kentucky Lake, the Birdsong Creek embayment hosted North America's only cultured freshwater pearl operation, founded by John Latendresse. This reach of West Tennessee is the setting for that state-gem story.

Pearls

Wayne County, Tennessee

Wayne County's Fort Payne and Mississippian limestones weather to release agatized fossils, gem-grade chert, and flint, and the Buffalo River gravel bars concentrate the harder Buffalo River chert long prized by knappers. The chert ranges from banded and agatized material to solid knapping flint. Quartz and agatized coral turn up in the same gravels.

Chert, Agatized Fossils, Flint, Quartz

Bedford County, Tennessee

Horse Mountain is the source of Horse Mountain agate, a tightly banded chalcedony from the Ordovician Hermitage Formation that is prized by lapidaries and flintknappers alike, with the thinnest cuts showing true iris color. Mindat catalogues the classic ground as the Silvertooth agate fields on private farmland near Wartrace. The agate weathers out as surface float and in creek gravels around the mountain.

Horse Mountain Agate

Cannon County, Tennessee

Cannon County is one of Middle Tennessee's defining geode counties, and the ground around Woodbury has produced large quartz geodes, including a roughly 20-inch specimen reported near the McMinnville road. The geodes weather from the Mississippian Warsaw and Fort Payne formations of the Highland Rim. Interiors are typically drusy quartz, sometimes with calcite.

Geode

Warren County, Tennessee

Ben Lomond Mountain lies in the Middle Tennessee geode belt along the Highland Rim, where quartz geodes are lined with calcite, celestite, dolomite, marcasite, and pyrite. It is cited as one of the state's notable celestite-bearing geode localities. The geodes weather out of the Mississippian carbonate and collect in the surrounding creek gravels.

Calcite, Celestite, Dolomite, Geode

Carter County, Tennessee

Roan Mountain anchors the Unaka Range that gives unakite its name, and the pink-and-green epidote granite occurs as cobbles in the stream gravels and roadside cuts along the TN 143 corridor. The Precambrian basement here is the same epidotized granite that made the material famous. Fresh slides after heavy rain along Forest Service roads regularly expose new pieces.

Unakite

Cocke County, Tennessee

Big Creek, in the Smoky Mountain foothills near Bluffton, is one of the few Tennessee streams known for green quartz, with some water-worn crystals reaching gem quality. The color comes from mineral inclusions in quartz shed from the surrounding Precambrian metamorphic rock. The creek gravels also carry clear quartz and other resistant pebbles.

Green Quartz

Monroe County, Tennessee

The Sweetwater district is a Mississippi Valley-type system in the Ordovician Knox Group that was mined for residual barite and carries fluorite, sphalerite, galena, and pyrite at depth. It is one of East Tennessee's documented barite-fluorite occurrences, spanning parts of Monroe, McMinn, and Loudon counties. Weathered barite and fluorite still turn up in the residual clays and cuts across the district.

Barite, Fluorite, Sphalerite

Polk County, Tennessee

Ducktown sits on the Copper Basin, a Precambrian massive-sulfide deposit that made it one of the most important copper districts in the Southeast. The Burra Burra Mine worked ore below 2,400 feet from 1899 to 1959 and left dumps historically rich in chalcopyrite, pyrrhotite, magnetite, garnet, and staurolite. The reclaimed red-hills landscape and the Ducktown Basin Museum document a mining story with few equals in the state.

Azurite, Chalcopyrite, Garnet, Gold

Unicoi County, Tennessee

The Unaka Range is the type locality for unakite, the pink-and-green ornamental rock named after these mountains, an intergrowth of pink orthoclase, green epidote, and quartz weathered from the Precambrian basement. The stone turns up as float in the Nolichucky drainage and as outcrops along the higher ridges. It is one of the few Tennessee localities on public land where a hobbyist can legally surface-collect.

Epidote, Quartz, Unakite

Bastrop County, Texas

The Colorado River at Smithville is a navigable Texas river, so its bed is state-owned public land, and the City of Smithville maintains free river access at Vernon L. Richards Riverbend Park beneath the Highway 71 bridges. Bastrop County is classic petrified palm wood country, the Texas state stone, with petrified wood and agate occurring in the river gravels and the Catahoula Formation.

Petrified Palm Wood, Petrified Wood, Agate

Llano County, Texas

The roadcut on Texas Highway 16 about nine miles north of Llano slices through the only known outcrop of llanite, a 1.1-billion-year-old rhyolite porphyry flecked with blue quartz crystals found essentially nowhere else on Earth. The blue color comes from microscopic ilmenite inclusions in the quartz, set in a matrix studded with reddish microcline feldspar. It is the single publicly reachable exposure of the rock.

Llanite, Blue Quartz

Grayson County, Virginia

The Troutdale area sits on the Blue Ridge basement where unakite, the pink-and-green epidote-feldspar granite that is one of Virginia's signature lapidary stones, weathers out along creeks and cuts alongside epidote and red jasper. Mindat and Virginia Department of Energy records document the occurrences, making this southwestern corner a reliable free tumbling-rough locality.

Epidote, Red Jasper, Unakite

Patrick County, Virginia

The mica schists around Stuart carry a rich metamorphic suite, with almandine garnet, staurolite fairy stones, corundum, and kyanite all documented in the Blue Ridge basement rocks by Mindat and Virginia geologic survey mapping. Road cuts and float in the Route 8 corridor make it a productive crystal-collecting companion to nearby Fairy Stone.

Almandine Garnet, Staurolite, Corundum, Kyanite

Albemarle County, Virginia

Buck Mountain Creek is a documented Albemarle County agate locality where chalcedony and banded agate weather into the stream gravels of the western Piedmont. Mindat records the agate occurrence, and stream-gravel hunting makes it an easy, low-impact free stop near Charlottesville.

Agate

Amelia County, Virginia

The Amelia pegmatite district is one of the most productive rare-mineral areas on the East Coast, long famous for gem amazonite, blue-green beryl, topaz, and cleavelandite. Mindat and USGS pegmatite studies document the Rutherford and Morefield pegmatites here, making Amelia the premier stop in Virginia for pegmatite gem minerals.

Amazonite, Amethyst, Feldspar, Cleavelandite

Amherst County, Virginia

The Fancy Hill area of Amherst County is a well-known Blue Ridge amethyst and quartz locality, where purple crystals and quartz veins occur in the crystalline basement. Mindat and Virginia mineral-locality references document the amethyst here, adding a productive gem-quartz stop to the central Blue Ridge.

Amethyst, Quartz

Henry County, Virginia

Fairy Stone State Park is Virginia's most famous staurolite locality, source of the twinned iron-aluminum silicate crosses that give the park its name. Mindat and Virginia Department of Energy geology records document the staurolite in the surrounding Piedmont schist, and the park is built specifically around collecting the crosses, making it the state's signature and most beginner-friendly rockhounding stop.

Staurolite

Rockbridge County, Virginia

Irish Creek is Virginia's classic tin locality, a greisen and pegmatite system in the George Washington National Forest that produced the state's best cassiterite along with blue moonstone feldspar. Mindat and Virginia Division of Mineral Resources reports document the tin-bearing pegmatites, and the national-forest setting makes it one of the more accessible historic mineral districts in the state.

Blue Moonstone, Cassiterite

Fluvanna County, Virginia

The Kidd's Store area of Fluvanna County is one of Virginia's few documented rhodonite localities, where the pink manganese silicate occurs in the Piedmont metamorphic rocks. Mindat records the rhodonite occurrence, giving lapidary collectors an unusual and distinctly Virginian material away from the state's more common quartz and unakite.

Rhodonite

Fluvanna County, Virginia

Byrd Creek lies in the Virginia gold-pyrite belt, the Piedmont trend that produced the state's historic lode and placer gold, and its gravels still yield fine placer gold to panners. Mindat and USGS gold-belt studies document the mineralization, making it one of the few genuinely free gold-panning creeks in central Virginia.

Gold, Quartz

Loudoun County, Virginia

The Triassic diabase and basalt of the Culpeper Basin in Loudoun County host a classic Virginia zeolite suite, with prehnite, stilbite, natrolite, and datolite lining vugs and fractures. Mindat and Virginia geologic-survey records document the zeolite occurrences in the diabase, giving northern Virginia collectors a distinctive trap-rock mineral association.

Calcite, Datolite, Epidote, Natrolite

Clallam County, Washington

Agates were once plentiful enough at Agate Bay, just west of Crescent Bay on the Strait of Juan de Fuca, to give the beach its name, and agate still weathers from the local basalt alongside variously colored chert and jasper. The setting on the northern Olympic Peninsula makes it one of the few documented agate beaches on the strait.

Agate, Chert, Jasper

Kittitas County, Washington

Red Top Mountain sits on the Eocene Teanaway Basalt, the rock unit Washington geologists identify as the source of the area's chalcedony, agate, and quartz-lined geodes. The collecting beds along the ridge yield blue and clear chalcedony nodules, thunder eggs, and crystal-lined geodes including amethyst. The site lies on the Okanogan-Wenatchee National Forest and has drawn hobby collectors for generations.

Blue Agate Geode

Kittitas County, Washington

The Liberty and Swauk district produced some of the finest crystalline and wire gold specimens in the United States, formed in epithermal quartz veins above town and recovered as coarse nuggets in Swauk and Williams creeks. Hard-rock mines in the hills yield the crystallized gold, while placer ground in the valley has produced sizable nuggets. The district has been prospected continuously since the 1873 Swauk Creek gold rush.

Gold

Kittitas County, Washington

The Saddle Mountains expose a petrified forest preserved between Wanapum Basalt flows roughly 14 to 15 million years old, and the area is one of the few places where collectors can legally gather Washington's state gem on public land. On BLM-managed ground near Beverly, surface collection of petrified and opalized wood is allowed under federal personal-use rules of 25 pounds plus one piece per day. Agate, jasper, and chalcedony turn up alongside the wood.

Opalized Wood, Petrified Wood

Okanogan County, Washington

Tunk Creek is one of Washington's few documented thulite localities, where rose-pink thulite, a variety of zoisite, occurs in lenses up to three feet across within hornblende schist. The same schist hosts corundum, including blue sapphire and pink to red crystals associated with the thulite, an unusual pairing recorded by the USGS Mineral Resources Data System and mindat. Quartz and plagioclase round out the assemblage in the Okanogan highlands.

Quartz, Blue Corundum, Pink Corundum, Thulite

Franklin County, Washington

Iron-stained gravels at the base of the White Bluffs, on the east side of the Columbia River from Byers Landing to Ringold, hold frequent agate and jasper, the agate chiefly gray and buff chalcedony with some red hues. The Ringold Springs access here is Washington Department of Fish and Wildlife land on the Franklin County bank, outside Hanford Reach National Monument.

Agate

Clark County, Washington

Gravel bars along the Washougal River yield moss agate, carnelian, jasper, and petrified wood weathered from the surrounding volcanic terrain. The best collecting follows high water, when receding flows expose fresh gravel along the bars. The only documented amethyst in the area is a small amount of amethystine quartz on a mine dump upriver in Skamania County, not the Clark County riverbank.

Moss Agate, Amethyst

Grays Harbor County, Washington

The beach at Moclips lies within Washington's Seashore Conservation Area, documented in rockhounding guides for the agate and jasper that wash in along the tideline and stream gravels. State ocean beach rules allow small-scale collecting year round, so loose agate and jasper can be picked up for personal use. Material concentrates near the low-tide line after winter storms expose fresh gravel.

Agate, Jasper

Lewis County, Washington

The Washington Geological Survey's gemstone report records that hundreds of pounds of agate have been taken between Adna and Pe Ell, in the heart of Lewis County's carnelian-agate country. Carnelian, the local red-orange chalcedony, occurs with agate, jasper, and dark petrified wood in the stream gravels. Most of the surrounding Willapa Hills is gated private timberland.

Agate, Carnelian, Chalcedony, Geode

Pacific County, Washington

The Washington Geological Survey documents light-gray to yellowish-gray chalcedony casts of fossil clams in the Willapa Hills, some holding trapped water that shifts when the specimen is turned, a feature collectors call enhydros. The surrounding marine sedimentary rocks yield abundant pelecypod, gastropod, and crab fossils. The agatized shells are a distinctive Pacific County specialty.

Agatized Fossil Shells

Bayfield County, Wisconsin

The Lake Superior shoreline of Bayfield County, along the State Highway 13 corridor between Port Wing and Cornucopia, is a classic stretch of public agate beach. Town and county beaches at Port Wing, Herbster, and Cornucopia present gravel and cobble that yield Lake Superior agates, jasper, and basalt, concentrated after storms. Collecting is legal on these municipal beaches, unlike the neighboring Apostle Islands National Lakeshore, where it is prohibited.

Agate, Jasper

Iron County, Wisconsin

The Montreal River gorge below Saxon Falls exposes Keweenawan basalt whose gas cavities are lined with zeolite minerals. The Wisconsin Geological and Natural History Survey records prehnite and thomsonite here, along with calcite, epidote, laumontite, and chlorite in the amygdaloidal flows. The falls sit on a hydroelectric project with a public overlook and parking, so the loose float along the public river access is the practical collecting ground.

Calcite, Chlorite, Epidote, Laumontite

Jackson County, Wisconsin

The reclaimed Jackson County iron mine, now the free Wazee Lake Recreation Area east of Black River Falls, is one of Wisconsin's premier metamorphic mineral localities. The Wisconsin Geological and Natural History Survey documents almandine garnet porphyroblasts up to 2 cm alongside staurolite, andalusite, kyanite, sillimanite, and magnetite in the mica schist and iron formation around the pit. Collecting is done on the waste-rock piles and schist exposures, since the open pit itself is now the deepest lake in the state.

Actinolite, Almandine, Andalusite, Biotite

Racine County, Wisconsin

Quarry Lake Park in Racine exposes the Silurian Racine Formation dolomite, part of the reef complex recognized as among the first fossil coral reefs described in North America. The reef flank beds here yield crinoid columnals, corals, brachiopods, and bryozoans, documented by the Field Museum and Milwaukee Public Museum reef projects. The park is a public Racine County facility, unlike the active commercial quarries nearby that are closed to collectors.

Fossils, Calcite, Marcasite

Iowa County, Wisconsin

The Wisconsin River gravel bars near Muscoda carry Lake Superior agates and quartz transported south by glacial outwash, giving the Driftless Area a rare source of free public collecting. Under Wisconsin's public trust doctrine, the beds of navigable rivers below the ordinary high-water mark are held open to the public, and surface-picking loose stones from sandbars is broadly permitted. Access is through public boat landings, with the exposed gravel bars richest at low summer water.

Agate

Fremont County, Wyoming

Sweetwater agate is Wyoming's signature agate, and the Sweetwater River drainage is the classic field area tied to the Granite Mountains source terrain. WSGS publications describe Sweetwater material among the state's better-known agates, while BLM rules make casual surface collecting possible on open public parcels when claims and ownership are checked first.

Agate

Fremont County, Wyoming

Atlantic City sits in the South Pass country, where Wyoming's gold-mining history overlaps with the central Wyoming jade and agate belt. The mix of quartz, muscovite, tourmaline, jasper, chalcedony, and nephrite makes it a broader hard-rock and float locality than the single-material Sweetwater agate stops nearby.

Agate, Chalcedony, Gold, Nephrite Jade

Fremont County, Wyoming

Warm Springs is a strong Granite Mountains-area pick because it combines Wyoming jade targets with agate, jasper, chalcedony, quartz, and silicified wood in one public-land collecting corridor. WSGS identifies jade as Wyoming's best-known gemstone and also lists agate, petrified wood, and quartz crystals among the state's important collector materials.

Agate, Chalcedony, Jasper, Jade

Park County, Wyoming

Kirwin is the strongest metallic-mineral contrast to Wyoming's agate and wood localities, with USGS work documenting the district's copper, gold, lead, zinc, molybdenum, and silver mineralization. The specimen suite, including chalcopyrite, galena, sphalerite, pyrite, quartz, azurite, and malachite, makes it a focused historic mining-district stop rather than another chalcedony field.

Azurite, Barite, Chalcopyrite, Cuprite

Sweetwater County, Wyoming

Eden Valley is the Wyoming benchmark for silicified and agatized wood, with Mindat records tying petrified wood to Eden Valley and the Blue Forest area. It also has unusually clear legal framing, since BLM specifically allows limited personal-use petrified wood collecting on open public land while keeping fossil and commercial-use rules separate.

Silicified Wood

Sweetwater County, Wyoming

Wamsutter is the practical Wyoming stop for dark fossiliferous lapidary material sold as Turritella agate, more accurately tied to silicified Green River Formation gastropods. The locality stands out because the material is both fossil-rich and polishable, but BLM fossil rules still matter because vertebrate fossils and scientifically significant specimens are not casual-collecting targets.

Turritella Agate

Lincoln County, Wyoming

Kemmerer anchors the western Green River Formation belt, where public-land outcrops and gravels can yield chert, chalcedony, jasper, silicified wood, and fossiliferous lapidary stone. It is included separately from the paid fossil-fish quarries because the best free collecting value is common lapidary material on verified public parcels, not commercial quarry access.

Turritella Agate, Chalcedony, Chert, Jasper

Albany County, Wyoming

The Laramie Mountains add a southeastern public-land agate, chalcedony, and jasper stop to a Wyoming list otherwise dominated by Sweetwater and Green River Basin material. WSGS mineral references also place the range in a broader hard-rock context, which gives the locality more geologic range than an ordinary gravel-bar agate stop.

Agate, Chalcedony, Jasper

Carbon County, Wyoming

Seminoe Reservoir represents the Seminoe Mountains side of Wyoming's jade and lapidary-rock story, with WSGS noting silicified banded iron formation from the Seminoe Mountains alongside the state's better-known jade resources. It earns a top-10 place because it broadens the Wyoming set into Carbon County while staying tied to a distinctive hard, polishable material.

Jade

Platte County, Wyoming

Hartville is the southeastern Wyoming choice for Guernsey Limestone chalcedony, including moss agate, dendritic agate, stalactitic agate, and youngite noted by WSGS. Its appeal is the combination of lapidary-grade silica and mining-district geology in a part of the state outside the central Sweetwater jade and agate belt.

Agate, Moss Agate, Chalcedony

Beaver County, Utah

Frisco combines a major historic silver-lead camp with a long mineral list that includes copper carbonates, galena, sphalerite, pyrite, opal, and wulfenite. Mindat documents the San Francisco district's specimen minerals, while USGS mapping and Utah history sources place the locality in one of Beaver County's most important mining landscapes.

Azurite, Barite, Calamine, Chalcocite

Emery County, Utah

The San Rafael Swell is a broad exposed anticline where Morrison, Curtis, and Cedar Mountain strata carry local agate, jasper, chalcedony, petrified wood, and dinosaur-bone material. BLM manages the Swell as a major public recreation area, and UGS describes the same formations as part of the area's collectible rock and mineral resource base.

Agatized Wood, Amethyst, Carnotite, Petrified Wood

Juab County, Utah

The Dugway Geode Beds are one of Utah's clearest geology-to-specimen localities: Miocene rhyolite cavities were eroded by Lake Bonneville and redeposited as diggable geodes in lake sediments. BLM lists the beds as a rockhounding hotspot, and UGS notes that the geodes commonly contain clear, purple, or pink quartz.

Beryl, Chalcedony, Fluorite, Garnet

Juab County, Utah

Spor Mountain stands out because its topaz-rhyolite-related deposits made it the world's premier beryllium district and Utah's largest fluorite producer. Mindat documents bertrandite, fluorite, chalcedony, opal, carnotite, hematite, magnetite, pyrite, quartz, and topaz across the district, which makes it more than a single-specimen stop.

Fluorite, Bertrandite, Carnotite, Chalcedony

Juab County, Utah

Topaz Mountain is Utah's defining gem locality, where amber topaz crystals formed in cavities of the Topaz Mountain Rhyolite and commonly bleach colorless in sunlight. The BLM identifies the area as a public rockhound recreation site, while the Utah Geological Survey documents topaz, red beryl, amethyst, garnet, bixbyite, opal, and hematite in the same volcanic field.

Beryl, Calcite, Bixbyite, Carnelian

Millard County, Utah

Black Rock is Utah's standout obsidian stop, with black, reddish-brown, and snowflake obsidian weathering from young rhyolitic volcanic rocks in the Black Rock Desert. UGS places the Black Spring collecting area on BLM public land and ties the glass to eruptions that also produced rhyolite and pumice in western Millard County.

Snowflake Obsidian

Piute County, Utah

Marysvale earns a top spot for small but well-formed crystals in rhyolite cavities, especially bixbyite, amethyst, and reported rutile or pseudobrookite. UGS describes the occurrence as BLM public land in a mid-Tertiary volcanic field, and Mindat records the same locality north of Marysvale with bixbyite, amethyst, pseudobrookite, and rutile.

Cinnabar, Alunite, Albite, Biotite

Tooele County, Utah

Gold Hill is one of Utah's most mineralogically varied old districts, with arsenic, gold, copper, lead, silver, tungsten, and zinc production tied to skarn, vein, and replacement deposits. UGS identifies it as Utah's leading historical producer of tungsten and arsenic, and Mindat records a broad suite of collectible secondary copper, lead, and zinc minerals around the district.

Azurite, Cerussite, Chalcopyrite, Chlorite

Tooele County, Utah

The Tooele side of Great Salt Lake offers an unusual sediment specimen rather than a hard-rock target: oolitic sand made of calcium-carbonate coats around tiny nuclei in shallow, wave-agitated brine. UGS documents accessible oolitic dunes on BLM public lands at Stansbury Island and explains that Great Salt Lake sand is often chemically grown in the lake rather than washed down as quartz grains.

Aragonite, Bloedite, Gypsum, Halite

Wayne County, Utah

The Hanksville and Caineville stretch of Wayne County is a strong public-land agate and petrified-wood area because weathering has released chalcedony, chert, jasper, and silicified wood from Mesozoic sedimentary rocks. UGS describes BLM public land where specimens can be found close to the road, while Utah collecting rules make clear that petrified wood has personal-use limits and protected park or private lands must be avoided.

Agate, Jasper, Petrified Wood

Palo Pinto County, Texas

Mineral Wells Fossil Park exposes Pennsylvanian marine shale roughly 300 million years old, where eroded slopes yield abundant crinoid stems, brachiopods, sea urchins, and bivalves. The City of Mineral Wells runs the site as a free public park, and visitors may keep what they find for personal use. It is one of the most accessible fossil-collecting sites in North Texas.

Crinoid Stems, Brachiopods, Echinoids, Bivalves

Fannin County, Texas

The North Sulphur River channel at Ladonia cuts into Late Cretaceous marine beds that yield shark teeth, mosasaur teeth and bone, ammonites, and Exogyra oysters. The Upper Trinity Regional Water District operates the site as a free public fossil park, and what visitors find is theirs to keep. Mosasaur material is among the more common vertebrate finds.

Fossilized Shark Teeth, Ammonites, Mosasaur Teeth, Fossilized Oysters

Burleson County, Texas

Whiskey Bridge exposes the Stone City beds of the Eocene Crockett Formation, widely regarded as the most fossiliferous marine outcrop in Texas, with well over 200 identified species. Collectors routinely recover Eocene snails such as Turritella, clams, small corals, and tusk shells from the bluff below the State Highway 21 bridge. The Brazos River bed here is state-owned navigable land open to the public.

Fossil Snails, Fossilized Shells, Coral, Scaphopods

McLennan County, Texas

The Brazos is a navigable Texas river, so its bed is state-owned and open to public use where reached from a public access point. Brazos Park East in Waco provides a free city boat ramp onto that bed, where exposed gravel bars carry petrified wood, agatized wood, agate, and chert washed down from upstream formations. Low water exposes the best gravel.

Petrified Wood, Agatized Wood, Agate, Jasper

Llano County, Texas

The Llano River cuts through the Precambrian Llano Uplift, so its gravels carry granite, gneiss, schist, garnet, and quartz, including the blue quartz that defines local llanite. Grenwelge Park gives free public access to the south bank of this navigable river in the town of Llano. Several other free city parks nearby also reach the river.

Blue Quartz, Quartz, Almandine Garnet, Granite

Houston County, Texas

The Davy Crockett National Forest sits in the petrified-wood belt of East Texas, where silicified and agatized wood weathers out of Catahoula and Manning Formation gravels alongside jasper and agate. The US Forest Service issues free use permits for personal collection of petrified wood and common lapidary minerals on the forest. Vertebrate fossils and artifacts remain off limits.

Petrified Wood, Agatized Wood, Jasper, Agate

San Jacinto County, Texas

Sam Houston National Forest carries petrified palm wood, the official Texas state stone since 1969, along with agate, jasper, and chalcedony weathered from young Gulf Coastal Plain gravels. The US Forest Service permits personal collection of common lapidary minerals and petrified wood here under a free use permit. Vertebrate fossils and artifacts are excluded.

Petrified Palm Wood, Petrified Wood, Agate, Jasper

Wise County, Texas

The Lyndon B. Johnson National Grassland exposes Cretaceous limestone full of fossil oysters along its ridges, plus agate, chert, and petrified wood in its sandy soils. The US Forest Service allows personal collection of common minerals, petrified wood, and invertebrate fossils here under a free use permit. Vertebrate fossils and artifacts are prohibited.

Fossilized Oysters, Agate, Petrified Wood, Chert

Douglas County, Colorado

Devils Head sits in the Pikes Peak granite of the Rampart Range, where weathered pegmatite pockets have produced large topaz and smoky quartz crystals along with amazonite and fluorite. The locality lies on Pike National Forest land, and personal-use specimen collecting with hand tools is allowed on open ground. It is one of the classic crystal-pocket areas of the Front Range.

Smoky Quartz, Topaz, Amazonite, Fluorite

El Paso County, Colorado

St. Peters Dome is a Pikes Peak granite peak in Pike National Forest where the historic Cheyenne fluorspar district left dumps that still yield loose purple, green, and white fluorite within a short walk of the parking area. Smoky quartz, amazonite, zircon, and topaz occur in the same granite. The collecting ground sits south of the Bear Creek watershed closure, so it remains open to casual hand-tool collecting.

Fluorite, Smoky Quartz, Amazonite, Zircon

Park County, Colorado

The Tarryall Mountains are one of the better topaz localities in the Pikes Peak region, with smoky quartz and pale amazonite in pegmatites of the Redskin Stock. Trails from Spruce Grove Campground on Pike National Forest lead to mine tailings where collectors have found smoky topaz. Personal-use collecting with hand tools is allowed on the surrounding open Forest Service ground.

Smoky Quartz, Topaz, Amazonite

Saguache County, Colorado

The thunderegg beds northwest of Del Norte have yielded plume and moss agate from rhyolite flows since the late 1800s, with chalcedony, common opal, and quartz-lined cavities documented at the locality. The beds lie on Rio Grande National Forest and adjacent BLM land at the south end of the La Garita Mountains. Plume agate is the signature material.

Plume Agate, Moss Agate, Chalcedony, Common Opal

Saguache County, Colorado

Crystal Hill near La Garita is documented by the USGS as a source of clear rock crystal and pale lavender amethyst in brecciated volcanic rock, a San Luis Valley collecting site worked since the 1880s. The BLM reclaimed the old mine workings around 2009 and allows public collecting on the reclaimed ground. Smoky quartz and manganese oxides occur in the same host.

Amethyst, Quartz, Smoky Quartz

Alger County, Michigan

Grand Marais is the most famous place in Michigan to hunt Yooperlites, sodalite-bearing syenite stones that glow bright orange under ultraviolet light. Woodland Park provides free public Lake Superior beach to search after dark, where the shoreline below the high-water mark is public land. Lake Superior agates and jasper turn up in the same gravel by day.

Yooperlite, Lake Superior Agate, Jasper

Chippewa County, Michigan

Drummond Island is one of the best places in Michigan to find pudding stone, a striking metaconglomerate of red jasper pebbles set in white quartzite that glaciers carried south from Ontario. The Township Park puts a free public Lake Huron beach and boat launch within five miles of the ferry. The shoreline below the high-water mark is public land open to collectors.

Pudding Stone, Jasper Conglomerate, Petoskey Stones

Oxford County, Maine

The historic Harvard Quarry on Noyes Mountain produced the gem green tourmaline that gave the Harvard green color its name, and its dumps still yield schorl, beryl, smoky quartz, rose quartz, and purple apatite. The quarry acre is held open to the public by its private owner at no charge, and the surrounding Noyes Mountain Preserve permits rock hounding under the Western Foothills Land Trust.

Green Tourmaline, Schorl, Beryl, Rose Quartz

Franklin County, Maine

The Maine Geological Survey lists the Sandy River from Avon to New Sharon as open to recreational gold prospecting, one of the few reaches where even motorized methods are allowed. The gold is fine placer flour gold carried in the river's black sand, with garnet and magnetite among the heavy concentrates. The state maintains a free public boat access on the river off Route 2.

Gold, Garnet, Magnetite

Washington County, Maine

The Maine Geological Survey lists the St. Croix River at Baileyville among the state's recreational gold-panning streams, where the gold is very fine flour gold thought to be shed from nearby base-metal mineralization. A state-owned boat access on the Grand Falls Flowage gives free public entry to the water. Garnet and magnetite occur in the same black sand.

Gold, Garnet, Magnetite

Hancock County, Maine

Tunk Mountain is carved from the Tunk Lake pluton, a concentrically zoned alkali granite that grades into rapakivi granite, producing smoky quartz, perthitic feldspar, and dark hornblende-bearing rock. The peak sits on Donnell Pond Public Reserved Land, where the Maine Geological Survey allows casual hobby collecting without a permit. It is a granite-and-quartz site rather than a gem pegmatite.

Smoky Quartz, Feldspar, Hornblende, Biotite

Linn County, Oregon

Quartzville Creek runs through a designated recreational mining corridor on BLM public land east of Sweet Home, where a stretch of the Wild and Scenic River is withdrawn from mineral entry but left open to casual prospecting. Panners recover fine placer gold and occasional small flakes from the creek gravels, which also carry quartz, agate, and jasper eroded from the surrounding volcanic rocks. The corridor sits below the historic Quartzville Mining District, the lode source for the area's gold.

Gold, Agate, Jasper, Quartz

Deschutes County, Oregon

Hampton Butte, north of Brothers in central Oregon, is the classic source of green petrified wood, where Eocene wood was replaced by jasper and chalcedony and tinted by copper and iron minerals. Collecting on the surrounding BLM public land turns up petrified wood, limb casts, agate, and jasper, with the prized pieces ranging from turquoise to dark green. Mindat catalogs the locality in Deschutes County, and the wood has been documented in scientific studies of Oregon's fossil forests.

Petrified Wood, Jasper, Agate

Lower Connecticut River Valley Planning Region, Connecticut

The Case Quarries are one of only three sites in Connecticut where mineral collecting on state land is legally sanctioned, set in the pegmatites of Meshomasic State Forest. The dumps and pegmatite have produced blue and green gem beryl, some crystals reaching 15 cm, along with columbite, monazite, muscovite, smoky quartz, and garnet. Worked for feldspar in the 1930s, the site is now managed by CT DEEP for permitted educational collecting.

Beryl, Aquamarine, Columbite, Feldspar

Lower Connecticut River Valley Planning Region, Connecticut

Clark Hill in Meshomasic State Forest is a second DEEP-sanctioned collecting site and includes the well-known Nathan Hall Quarry. Its pegmatites carry sharp books of muscovite, large almandine garnet, beryl in colors from yellow through aqua, and the uranium micas autunite and torbernite, along with fluorapatite and pocket microcline. It is one of the few places in Connecticut where the classic New England pegmatite suite can be collected legally.

Beryl, Aquamarine, Garnet, Muscovite

Lower Connecticut River Valley Planning Region, Connecticut

The CCC Quarry, a 19th-century feldspar working near the old Civilian Conservation Corps camp in Cockaponset State Forest, is the third state-sanctioned collecting site in Connecticut. Its pegmatite carries microcline, albite, muscovite, schorl, and beryl including aquamarine, with historic reports of uraninite and autunite. It rounds out the DEEP trio that keeps legal pegmatite collecting alive in the state.

Beryl, Aquamarine, Microcline, Albite

Douglas County, Wisconsin

Wisconsin Point, a three-mile public sand and gravel spit at the mouth of Superior Bay, is the state's most accessible Lake Superior agate beach. The agates are wave and glacially transported nodules of banded chalcedony weathered from the billion-year-old Keweenawan basalts, and the strand line also yields jasper, drift copper, and basalt. The point is owned by the City of Superior and open to the public, with collecting best along the gravel lenses after storms and at low water.

Lake Superior Agate, Jasper, Copper, Basalt

Ashland County, Wisconsin

Big Bay Town Park on Madeline Island gives collectors a Lake Superior beach reachable by the Bayfield ferry. The long pebble and sand beach along Big Bay yields Lake Superior agates, jasper, and basalt cobbles, some carrying zeolite and thomsonite amygdules. The town park is public and open to collecting, in contrast to the adjacent Big Bay State Park, where rock removal requires written state permission.

Lake Superior Agate, Jasper, Thomsonite, Basalt

Iron County, Wisconsin

Saxon Harbor is Wisconsin's only county park on Lake Superior, set on Oronto Bay near the Michigan border. A 2020 reconstruction opened designated rock-picking beaches east and west of the harbor entrance, where collectors find Lake Superior agates, jasper, and occasional drift copper in the shoreline gravel. The park is a free Iron County facility with parking, boat launches, and beach access.

Lake Superior Agate, Jasper, Copper

Ozaukee County, Wisconsin

Lime Kiln Park near Grafton preserves two small Silurian reefs in the walls of a former limestone quarry along the Milwaukee River. The Field Museum records favositid and halysitid corals, stromatoporoids, brachiopods, and nautiloid cephalopods in the exposed dolomite. The park is a free Ozaukee County facility with interpretive trails through the old quarry and kiln ruins.

Fossils, Coral, Crinoids, Dolomite

Iron County, Wisconsin

The schist exposures near Powell, on the Manitowish Range, form one of Wisconsin's few good kyanite and staurolite localities. The Wisconsin Geological and Natural History Survey documents blue kyanite and staurolite porphyroblasts up to about 3 cm in mica schist with biotite, quartz, and oligoclase. The site lies in public forest country along State Highway 182, and regional gem and mineral clubs have run collecting trips here.

Kyanite, Staurolite, Almandine, Biotite

Monmouth County, New Jersey

Big Brook is New Jersey's best known free fossil stream, cutting Late Cretaceous marine beds of the Navesink Formation that are roughly 70 million years old. Collectors regularly find shark teeth (Squalicorax and Cretolamna), belemnite guards of Belemnitella americana, and Exogyra oyster shells weathering out of the streambed. Monmouth County manages it as public parkland with published fossil-collecting rules, which is rare for an East Coast site.

Shark Teeth, Belemnite, Fossils

Monmouth County, New Jersey

Poricy Brook exposes the same Late Cretaceous Navesink Formation as nearby Big Brook, and its fossil beds are among the most accessible in the state. Belemnites (Belemnitella americana), Exogyra costata oysters, and small shark teeth are common in the streambed gravel. The nonprofit Poricy Park Conservancy maintains a marked trail to the beds and rents sifting equipment on site.

Belemnite, Shark Teeth, Fossils

Monmouth County, New Jersey

Ramanessin Brook is a quieter alternative to Big Brook and Poricy, draining the same Late Cretaceous Monmouth Group marine sequence in Holmdel. Sifting its gravel bars turns up shark teeth (Squalicorax and Scapanorhynchus), ray denticles, and fish material weathered from beds roughly 70 million years old. It runs through township open space, and the Friends of Holmdel Open Space run free public fossil walks along it.

Shark Teeth, Fossils

Cape May County, New Jersey

Higbee Beach is a free, no-tag stretch of Delaware Bay shoreline where Cape May diamonds, wave-polished clear quartz pebbles, concentrate along the strand line. The quartz erodes from Cretaceous and Tertiary gravels upriver, tumbles down the Delaware, and washes up rounded on the bay beach. As a state wildlife management area it stays undeveloped, and collecting is best after storms.

Quartz, Chalcedony