Arnold — Rockhounding in Jefferson County, Missouri

Arnold is a mapped rockhounding spot in Jefferson County, Missouri. Reported finds include geode, dolomite, marcasite, pyrite, sphalerite, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Jefferson County
State: Missouri
Nearest road: Richardson Road
Postcode: 63010
Coordinates: 38.41917, -90.38958

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 Arnold

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 Arnold.

Across the state line from Arnold

Arnold 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.

Arnold FAQ

Where is Arnold?+

Arnold is in Jefferson County, Missouri, at 38.41917, -90.38958. Nearest road: Richardson Road.

What rocks and minerals can you find at Arnold?+

Arnold is reported to produce Geode, Dolomite, Marcasite, Pyrite, Sphalerite, Calcite.

Is collecting allowed at Arnold?+

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.

How do I get to Arnold?+

Open the directions link to navigate to 38.41917, -90.38958 in Google Maps. The nearest road is Richardson Road.

More rockhounding in Missouri

See all 94 Missouri spots →

Open Arnold on the map

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