Fluorite

When we look for quality of an Illinois fluorite we look for a glassy surface, color, phantoming, inclusions, and overall appeal. This small piece has all of those criteria. An internal cleave can be easily resolved with a vacuum seal if desired. Bitumen inclusions, some rod shaped, make this piece unusual.  Some chipping along one edge. The piece comes with two old labels.

Locality:  Cave-in-Rock, Hardin County, Illinois

Composition: calcium fluoride