Fluorite

A cluster of cubic purple fluorites to 1.5cm with distinct purple phantoms with cloudy opaque centers. Note the perfect side car crystal of gem quality! Bits of calcite and what I will surmise is a barite (almost looks like orthoclase, but from SI?) with a crude coating on the front. Original label claims “private locality”. A few nibbles as pictured.

Locality: Cave in Rock, Hardin County, Illinois

Composition: calcium fluoride