Where: Illinois · North America · approx. 37.47, -88.17 (vicinity only)
Why this spot: Rockhounding locality: Illinois-Kentucky fluorspar district (state mineral)
What turns up: fluorite (blue/purple/yellow), calcite, sphalerite, galena, barite
Access: Gray area.
Cave-in-Rock district mines are flooded/sealed and dumps sit on mostly private (much posted) land; collecting requires written landowner permission, club access, or buying from dealers.
Open in Mudlark Map →
Satellite view, historic-map overlays, tide/flow context and field notes are in the app. Exact research detail is part of Pro.
Pins are approximate by design. This page is historical research, not permission to dig. Check ownership and local law first.