Fredericktown: Aragonite & Azurite Rockhounding in Madison County, Missouri

Updated June 2026

Fredericktown is a mapped rockhounding spot in Madison County, Missouri. Reported finds include aragonite, azurite, calcite, cerussite, chalcocite, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Madison County
State: Missouri
Nearest road: County Road 274
Coordinates: 37.61538, -90.28467

Geology at Fredericktown

This spot sits on Elvins Group - (including Derby-Doerun Dolomite, Davis Formation), Bonneterre Dolomite, mapped as dolostone, shale, and siltstone that formed roughly 495 to 485 million years ago. Carbonate rock like this dissolves and weathers readily, so fresh road cuts, quarries, and creek exposures are typically the most productive ground.

Mapped unit: Elvins Group - (including Derby-Doerun Dolomite, Davis Formation), Bonneterre Dolomite
Age: 495–485 Ma (Furongian)
Rock types: dolostone, shale, and siltstone
Elevation: 830 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Best time to visit Fredericktown

Best months: February to December. Typical highs run 88°F in midsummer and 41°F in midwinter, with winter lows near 20°F.

Climate normals: NOAA 1991-2020 monthlies, FREDERICKTOWN station (4 mi away).

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Fredericktown

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Nearby rockhounding spots

Other rockhounding spots within driving distance of Fredericktown.

Across the state line from Fredericktown

Fredericktown is close enough to the Missouri border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Fredericktown FAQ

Where is Fredericktown?+

Fredericktown is in Madison County, Missouri, at 37.61538, -90.28467. Nearest road: County Road 274.

What rocks and minerals can you find at Fredericktown?+

Fredericktown is reported to produce Aragonite, Azurite, Calcite, Cerussite, Chalcocite, Chalcopyrite, Dolomite, Galena, Malachite, Marcasite, Pyrite, Quartz, Sphalerite.

Is collecting allowed at Fredericktown?+

Generally open to casual rockhounding. Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Fredericktown?+

A rock hammer, gloves, and safety glasses are enough for oxidized copper ground. Look for green and blue staining on weathered rock and in old dump piles.

When is the best time to visit Fredericktown?+

The most comfortable months at Fredericktown are February to December.

How do I get to Fredericktown?+

Open the directions link to navigate to 37.61538, -90.28467 in Google Maps. The nearest road is County Road 274.

More rockhounding in Missouri

See all 94 Missouri spots →

Open Fredericktown on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.