Calcite on Fluorite

A classic Cave in Rock specimen consisting of fluorite cubes zoning yellow to purple and us to 3.5cm on one side and a densley covered back side with amber calcite scalenohedrons. The surface of the fluorites has an odd dusty surface where the hydrocarbons are surficially included. Some minor edge wear and cleaving at peripheral corners and a bit of wear on a central crystal. Minor bruising to some calcites. All in all a superb value for someone wanting a decent example of this material.

Locality: Minerva #1 Mine, Cave in Rock, Hardin County Illinois

Composition: Calcium Fluoride and Calcium Carbonate