Rockhounding in Grundy County, Missouri

1 mapped rockhounding spot in Grundy County. Most commonly produces fossils, jasper, lake superior agate, petrified wood.

Grundy County rockhounding photos

Representative spot and material photos from this county, shown where verified public image records are available.

1 photo

A polished Lake Superior agate with banded fortification structure, the same tumble rounded ice transported agate documented from Grundy County glacial drift and stream gravels. — Grundy CountyGrundy County, Missouri

Minerals reported in Grundy County

Standout in Grundy County

Hand-picked spot in Grundy County, chosen for unusual mineralogy or documented public access. Each card opens the full coordinates and access notes.

Top pick
Grundy County
Public
Grundy County
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

Spots in Grundy County

Spot	Minerals	Coordinates	Access
Grundy County	Lake Superior Agate Jasper Fossils Petrified Wood	40.1196, -93.5296	Public

Neighboring counties in Missouri

Adjacent rockhounding counties, ranked by how close their centroids sit to Grundy County. A natural extension if Grundy County is already on your trip plan.

Across the state line from Grundy 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.

Van Buren County~99 miIowa · 3 spotsTop: Keokuk Geode, Coral, Geode

Grundy County FAQ

Where can I rockhound in Grundy County, Missouri?+

RockHoundR tracks 1 rockhounding spot in Grundy County. Each entry below has coordinates, mineral notes, and access type. Always confirm local rules before collecting.

What rocks and minerals are common in Grundy County?+

Spots in Grundy County most often produce Fossils, Jasper, Lake Superior Agate, Petrified Wood. Individual spots can vary widely.

Are these Grundy County rockhounding spots on public land?+

Most spots in this list are tagged public, but access can change with seasons, claims, and local closures. Always verify before driving out — links in the app open the right BLM, USFS, or county pages.

Plan a Grundy County rockhounding trip

Open RockHoundR to see these spots on the map alongside land overlays, weather, geology, and your saved finds.