Rockhounding in Lewis County, Missouri
2 mapped rockhounding spots in Lewis County. Most commonly produces agate, aragonite, calcite, chalcedony.
Lewis County rockhounding photos
Representative spot and material photos from this county, shown where verified public image records are available.
Map showing 2 rockhounding spots in Lewis County, Missouri
Minerals reported in Lewis County
Standouts in Lewis County
Hand-picked spots in Lewis County, chosen for unusual mineralogy or documented public access. Each card opens the full coordinates and access notes.
Top pickFabius River
PublicLewis County
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
Top pickLa Grange
PublicLewis County
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
Spots in Lewis County
| Spot | Minerals | Coordinates | Access |
|---|---|---|---|
| Fabius River275th Avenue | 39.9756, -91.6218 | Public | |
| La GrangeWharf Street | 40.0469, -91.4958 | Public |
Neighboring counties in Missouri
Adjacent rockhounding counties, ranked by how close their centroids sit to Lewis County. A natural extension if Lewis County is already on your trip plan.
- Ralls County~28 mi3 spotsTop: Pyrite, Marcasite, Silicified Conodonts
- Clark County~28 mi4 spotsTop: Geode, Calcite, Barite
- Boone County~81 mi3 spotsTop: Gypsum, Marcasite, Pyrite
- Saint Charles County~101 mi4 spotsTop: Fluorite, Fossils, Yellow Calcite
- Grundy County~104 mi1 spotTop: Fossils, Jasper, Lake Superior Agate
- Saint Louis County~112 mi4 spotsTop: Calcite, Quartz, Barite
Across the state line from Lewis County
Rockhounding counties in neighboring states within driving range. Geology rarely respects state borders — these are often the closest mapped spots you can reach without going deeper into Missouri.
Lewis County FAQ
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