Rockhounding in Rock Island County, Illinois

1 mapped rockhounding spot in Rock Island County. Most commonly produces agate.

Rock Island County rockhounding photos

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

1 photo

Cordova, Illinois on the Mississippi River, Rock Island County, seen from the water — CordovaRock Island County, Illinois

Minerals reported in Rock Island County

Agate1

Standout in Rock Island County

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

Top pick
Cordova
Public
Rock Island County
The Mississippi River gravel bars at Cordova are among Illinois's most reliable spots for Lake Superior agate, carried south by glacial meltwater from the agate source region in Minnesota and Wisconsin.
Agate

Spots in Rock Island County

Spot	Minerals	Coordinates	Access
CordovaRiver Road North	Agate	41.7160, -90.3112	Public

Neighboring counties in Illinois

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

Across the state line from Rock Island 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 Illinois.

Rock Island County FAQ

Where can I rockhound in Rock Island County, Illinois?+

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

What rocks and minerals are common in Rock Island County?+

Spots in Rock Island County most often produce Agate. Individual spots can vary widely.

Are these Rock Island 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 Rock Island County rockhounding trip

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