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Crystal Mine, Cave-in-Rock, Cave-in-Rock Sub-District, Hardin Co., Illinois, USA

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Latitude & Longitude (WGS84): 37° 28' 0'' North , 88° 9' 60'' West
Latitude & Longitude (decimal): 37.46667,-88.16666
Other regions containing this locality:Illinois-Kentucky Fluorspar District, Illinois/Kentucky, USA
Köppen climate type:Cfa : Humid subtropical climate

Ref.: Rocks & Min.: 24:248-249; 63:223; 64:18. A fluorite mine located near Cave-in-Rock. As of 1952 this mine included No.'s 3, 4, and 6 shafts.

Mineral List

6 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

330.9 - 346.7 Ma

ID: 2956559
St. Louis Limestone

Age: Mississippian (330.9 - 346.7 Ma)

Stratigraphic Name: St. Louis Limestone

Comments: Thickness from stratigraphic columns: St. Louis Ls (0-500’) in southern Illinois (south of 40 degrees north latitude); St. Louis (0-100’) in northern Illinois (north of 40 degrees north latitude). In southern Illinois, unit includes "Martinsville" in lower part, and "Westfield" in upper part.[Oil well drillers' terms shown in quotation marks.]

Lithology: Major:{limestone}, Minor:{dolostone}, Incidental:{anhydrite, gypsum}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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Weller, J.M., Grogan, R.M., and Tippie, F.E. (1952) Geology of the fluorspar deposits of Illinois. Illinois State Geological Survey, Bulletin 76: 147 pages

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