Fluorite with Sphalerite and Chalcopyrite

A pristine specimen featuring a 3.2cm elongated cube anchoring one corner of a densely stacked array of smaller cubes forming a stepped “Borg Ship” arrangement at the back and terminating into a smoother stepped surface on top. The bottom is coated with Sphalerites and the back has a druise and small crystals of Calcite, many embedded with Chalcopyrites.

Locality: Denton Mine, Harris Creek District, Hardin County, Illinois

Composition: calcium fluoride