Fluorite with Calcite, Quartz

specimen number:
9892096

location:
Minerva Mine #1, Hardin Co., Illinois, USA

description:
Deep purple slightly translucent semi lustrous crystals of fluorite to 2.2 cm on edge across a crystallized quartz matrix with calcite. In good condition with very minimal micro-damage present.

The Minerva Mine Number 1, located near Cave-in-Rock in Hardin County, Illinois, was a cornerstone of the historic Illinois-Kentucky fluorspar district. Discovered in 1940 and sinking its primary shaft in 1942, the mine operated intermittently until its final closure in 1996. Geologically, the deposit sits within Mississippian-age carbonate host rocks, where fluorine-bearing hydrothermal fluids migrated through regional faults and bedding-plane replacement zones to form rich ore bodies. Mineralogically, the mine achieved world-renowned status among collectors for producing spectacular specimens, most notably exceptionally sharp cubic and multi-colored fluorite crystals often associated with sphalerite, calcite, barite, strontianite, and witherite.

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