Absolutely in love with the colors of this Minerva Fluorite

Absolutely in love with the colors of this Minerva Fluorite Minerva fluorite refers to the highly sought-after, gemmy, and often vibrant blue or yellow-zoned fluorite crystals produced by the Minerva No. 1 Mine in Hardin County, Illinois. Operating from the 1940s to 1996, this mine is considered one of the world’s most famous, known for its exceptional, cubic, and often fluorescent specimens, especially from the “Bluecap” pocket. Key Characteristics of Minerva Fluorite: Color & Zoning: Known for intense, icy, or cornflower-blue colors, as well as yellow and rare amber tones. Often features distinctive phantom zoning (e.g., yellow cores with purple/blue outer zones). Form & Luster: Sharp cubic, gem-like, and “glass-like” crystals, sometimes featuring hoppered growth or “toadstool” formations. Fluorescence: Often displays bright, deep blue or white fluorescence under UV light, caused by hydrocarbon inclusions. Associations: Frequently found with associated minerals like calcite, baryte, and chalcopyrite. Provenance: Highly valued by collectors due to the closure of the mine and limited availability of top-tier, pristine specimens. The Minerva No. 1 Mine (part of the Ozark-Mahoning group) was a major source of fluorspar for industrial use before becoming famous for these aesthetic, display-quality mineral specimens.