Rockhounding in Alexander County, Illinois

2 mapped rockhounding spots in Alexander County. Most commonly produces agate, jasper, diamond.

Alexander County rockhounding photos

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

1 photo

Rock outcrop and river gravel along the Mississippi River at Thebes, Alexander County, Illinois, near Fayville — FayvilleAlexander County, Illinois

Minerals reported in Alexander County

Standout in Alexander County

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

Top pick
Fayville
Public
Alexander County
The Mississippi River gravel bars near Fayville and Thebes, at the far southern tip of Illinois, are the state's most productive agate ground, where fortification agate and jasper accumulate in the river sediment.
Agate, Jasper, Diamond

Spots in Alexander County

Spot	Minerals	Coordinates	Access
FayvilleThebes Road	Agate Jasper Diamond	37.1986, -89.4522	Public
ThebesOld Route 3	Agate Jasper	37.2393, -89.4422	Public

Neighboring counties in Illinois

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

Across the state line from Alexander 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.

Alexander County FAQ

Where can I rockhound in Alexander County, Illinois?+

RockHoundR tracks 2 rockhounding spots in Alexander County. Each entry below has coordinates, mineral notes, and access type. Always confirm local rules before collecting.

What rocks and minerals are common in Alexander County?+

Spots in Alexander County most often produce Agate, Jasper, Diamond. Individual spots can vary widely.

Are these Alexander 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 Alexander County rockhounding trip

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