Updated August 2026
55 mapped spots for rock hunting and rock collecting across 9 counties. Connecticut rockhounding is pegmatite country along the lower Connecticut River, where the Middletown district around Portland, Haddam, and East Hampton produced beryl, aquamarine, golden beryl, rose quartz, and tourmaline, plus the traprock ridges of the Hartford Basin with their chalcedony, prehnite, and zeolites, garnet in the western hills, and quartz pebbles on the Long Island Sound beaches.
The best rockhounding in Connecticut is at Guilford & East Haven in South Central Connecticut Planning Region (agate), Hubbard Park in South Central Connecticut Planning Region (quartz), and Plum Bank Beach in Lower Connecticut River Valley Planning Region (agate, moonstone). In total, 55 mapped collecting spots across 9 counties produce beryl, quartz, and aquamarine, each listed below with its land access.
Best spotClark Hill QuarriesLower Connecticut River Valley Planning Region, ConnecticutPublic access · Beryl, Aquamarine, Garnet +7
Best spotCase QuarriesLower Connecticut River Valley Planning Region, ConnecticutPublic access · Beryl, Aquamarine, Columbite +5
Best spotCCC QuarryLower Connecticut River Valley Planning Region, ConnecticutPublic access · Beryl, Aquamarine, Microcline +5
Best spotPlum Bank BeachLower Connecticut River Valley Planning Region, ConnecticutPublic access · Agate, Moonstone
Best spotGuilford & East HavenSouth Central Connecticut Planning Region, ConnecticutPublic access · Agate
Best spotHubbard ParkSouth Central Connecticut Planning Region, ConnecticutPublic access · Quartz
Collins HillLower Connecticut River Valley Planning Region, ConnecticutPublic access · Apatite, Aquamarine, Beryl +7
Hewitt Gem QuarryLower Connecticut River Valley Planning Region, ConnecticutPermission required · Beryl, Aquamarine, Morganite +7Case QuarryLower Connecticut River Valley Planning Region, ConnecticutPermission required · Albite, Microcline, Quartz +6East Granby QuarryCapitol Planning Region, ConnecticutPublic access · Datolite, Aragonite, Calcite +6Roebling MineWestern Connecticut Planning Region, ConnecticutPublic access · Aquamarine, Beryl, Biotite +5Gillette QuarryLower Connecticut River Valley Planning Region, ConnecticutPublic access · Amazonite, Aquamarine, Beryl +4Walden Gem QuarryLower Connecticut River Valley Planning Region, ConnecticutPublic access · Albite, Aquamarine, Beryl +4Bristol Copper MineNaugatuck Valley Planning Region, ConnecticutPublic access · Bornite, Chalcocite, Calcite +3Old Iron MineNorthwest Hills Planning Region, ConnecticutPublic access · Chalcopyrite, Galena, Pyrite +3WiltonWestern Connecticut Planning Region, ConnecticutPublic access · Arsenopyrite, Bismuth, Galena +3BridgewaterNorthwest Hills Planning Region, ConnecticutPublic access · Calamine, Galena, Cerussite +2Lane’s MineGreater Bridgeport Planning Region, ConnecticutPublic access · Arsenopyrite, Bismuth, Pyrite +2Long Hill MineGreater Bridgeport Planning Region, ConnecticutPublic access · Calcite, Fluorite, Pyrite Cube +2CCC PegmatiteLower Connecticut River Valley Planning Region, ConnecticutPermission required · Albite, Beryl, Columbite +1LitchfieldNorthwest Hills Planning Region, ConnecticutPublic access · Corundum, Pyrite, Staurolite +1MeridenSouth Central Connecticut Planning Region, ConnecticutPublic access · Quartz, Amethyst, Calcite +1Pelton’s QuarryLower Connecticut River Valley Planning Region, ConnecticutPublic access · Citrine, Rose Quartz, Smoky Quartz +1Simsbury MineCapitol Planning Region, ConnecticutPublic access · Chalcocite, Cuprite, Malachite +1StaffordSoutheastern Connecticut Planning Region, ConnecticutPublic access · Iron Ore, Limonite, Quartz +1BarkhamstedNorthwest Hills Planning Region, ConnecticutPublic access · Actinolite, Asbestos, SoapstoneMiddletownLower Connecticut River Valley Planning Region, ConnecticutPublic access · Galena, Chalcopyrite, SphaleritePine Rock QuarrySouth Central Connecticut Planning Region, ConnecticutPublic access · Prehnite, Calcite, SerpentineUnionNortheastern Connecticut Planning Region, ConnecticutPublic access · Feldspar, Moonstone, CordieriteBulls BridgeNorthwest Hills Planning Region, ConnecticutPublic access · Garnet, GoldCinque QuarrySouth Central Connecticut Planning Region, ConnecticutPublic access · Amethyst, Smoky QuartzFarmingtonCapitol Planning Region, ConnecticutPublic access · Agate, PrehniteGlastonburyCapitol Planning Region, ConnecticutPublic access · Columbite, FeldsparHale’s Brook QuarriesLower Connecticut River Valley Planning Region, ConnecticutPublic access · Beryl, PegmatiteMt. CarmelSouth Central Connecticut Planning Region, ConnecticutPublic access · Bornite, ChalcociteNew LondonSoutheastern Connecticut Planning Region, ConnecticutPublic access · Apatite, SpodumeneNorwichSoutheastern Connecticut Planning Region, ConnecticutPublic access · Corundum, SillimaniteOld Simpson QuarryCapitol Planning Region, ConnecticutPublic access · Aquamarine, Smoky QuartzRiverside QuarryLower Connecticut River Valley Planning Region, ConnecticutPublic access · Aquamarine, BerylSlocum ProspectLower Connecticut River Valley Planning Region, ConnecticutPublic access · Beryl, Rose QuartzTollandCapitol Planning Region, ConnecticutPublic access · Rose Quartz, StauroliteTorringtonNorthwest Hills Planning Region, ConnecticutPublic access · Agate, PrehniteVernonCapitol Planning Region, ConnecticutPublic access · Rose Quartz, StauroliteWhite Rocks QuarryLower Connecticut River Valley Planning Region, ConnecticutPublic access · Beryl, TourmalineAldrich ParkWestern Connecticut Planning Region, ConnecticutPublic access · QuartzBantam LakeNorthwest Hills Planning Region, ConnecticutPublic access · Rose QuartzBethanySouth Central Connecticut Planning Region, ConnecticutPublic access · GraphiteCantonCapitol Planning Region, ConnecticutPublic access · AmethystCornwallNorthwest Hills Planning Region, ConnecticutPublic access · GraphiteDanburyWestern Connecticut Planning Region, ConnecticutPublic access · GraphiteGreenwichWestern Connecticut Planning Region, ConnecticutPublic access · SoapstoneLamberts MineSouth Central Connecticut Planning Region, ConnecticutPublic access · ChalcopyriteNew Haven Traprock QuarrySouth Central Connecticut Planning Region, ConnecticutPublic access · AmethystReddingWestern Connecticut Planning Region, ConnecticutPublic access · GraphiteRockvilleCapitol Planning Region, ConnecticutPublic access · WhetstoneRepresentative spot and material photos from locations in this state, shown where verified public image records are available.
Counts reflect how many spots in this list mention each mineral.
Notable areas: Middletown district beryl and aquamarine, Roxbury garnet, Haddam chrysoberyl, Farmington Valley traprock chalcedony and prehnite, and Long Island Sound beach jasper are the Connecticut targets collectors travel for.
The state is split by the Hartford Basin, a Triassic and Jurassic rift filled with red sandstone and shale and interlayered basalt flows. Those flows form the Hanging Hills at Meriden and the Talcott Range and carry chalcedony, agate, prehnite, datolite, and zeolites in old traprock quarries; the sandstone holds the Rocky Hill dinosaur tracks. East of the basin the Eastern Highlands are Devonian gneiss and schist intruded by the pegmatites of the Middletown district: Strickland, Case, Clark Hill, and the CCC quarries around Portland, East Hampton, and Haddam produced beryl in several colors, tourmaline, rose quartz, columbite, and Haddam's type-locality chrysoberyl. The Western Highlands are older gneiss and marble with almandine garnet in the schists around Roxbury, staurolite and kyanite in the Litchfield hills, graphite and pyrite in old prospects, and the Bristol copper mine's chalcocite. Glacial drift and the Sound beaches at Old Saybrook, Guilford, and East Haven collect quartz, jasper, and chalcedony pebbles.
Case, Clark Hill, and the CCC quarries are the classic dumps for beryl, aquamarine, rose quartz, and tourmaline. Some sit on state forest where removal needs DEEP permission; others are private and open only on club days.
Chalcedony, agate, prehnite, and zeolites from the basalt. Hubbard Park in Meriden is a look-but-check-first city park; the working quarries open only on arranged visits.
Almandine garnet at the Roxbury garnet ground, staurolite and kyanite in Litchfield County schist, copper minerals around Bristol. Almost all private; ask the landowner.
Quartz, jasper, and chalcedony pebbles on public beaches like Plum Bank, best after winter storms. Surface picking only.
April through November for the pegmatite dumps and highlands; spring after snowmelt exposes fresh talus and rain washes the dumps. Beach pebbles are best in winter and after storms. Frozen ground and mud close the inland sites from December to March.
Rock hammer, chisels, safety glasses, gloves, a hand lens for spotting beryl in feldspar, a small pry bar for dump blocks, and a bucket. Poison ivy and ticks are the real hazards on old quarry dumps; wear long pants.
The Middletown district's pegmatites were quarried for feldspar and mica from the early 1800s, with Strickland Quarry in Portland becoming one of the most famous mineral localities in the Northeast. Bristol's copper mine worked from 1836, and Rocky Hill's dinosaur tracks, found in 1966, became Dinosaur State Park. Almandine garnet was named the state mineral in 1977.
Day-trip range. Each section lists the closest mapped rockhounding spots within about 150 miles of the city. Most are inside a 2 to 3 hour drive.
6 closest spots to Hartford, CT.
Geology rarely respects state borders. These states share mapped rockhounding country with Connecticut, useful when Connecticut is the start, not the whole trip. Each card links to the closest county across the line.
County pages are linked once we have at least 3 mapped spots for a focused guide with coordinates, mineral notes, and nearby spots.
Hand-picked standouts from the Connecticut list, chosen for unusual mineralogy, documented public access, or both. Each card links to coordinates, access notes, and what to look for.
Top pickSouth Central Connecticut Planning Region
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.
Agate
Top pickSouth Central Connecticut Planning Region
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.
Quartz
Top pickLower Connecticut River Valley Planning Region
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.
Agate, Moonstone
Top pickLower Connecticut River Valley Planning Region
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.
Beryl, Aquamarine, Columbite, Feldspar
Top pickLower Connecticut River Valley Planning Region
Clark Hill in Meshomasic State Forest is a second DEEP-sanctioned collecting site and includes the well-known Nathan Hall Quarry.
Beryl, Aquamarine, Garnet, Muscovite
Top pickLower Connecticut River Valley Planning Region
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.
Beryl, Aquamarine, Microcline, Albite
6 clubs in Connecticut. Clubs run field trips, shows and workshops, and many trips go to private claims you can't reach alone.
Open the RockHoundR app to see Connecticut on a real map with public land overlays, weather, geology, and your saved finds.
