mineral

Blue-green fluorite crystal

Fluorite (calcium fluoride, CaF₂)

AI-generated identification · may be incorrect

Typically translucent blue-green with glassy luster, cubic crystal structure, and perfect octahedral cleavage; Mohs hardness 4 and specific gravity about 3.18. The specimen appears rough or partially polished, with internal fractures and color zoning.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and carbonate-hosted deposits when fluorine-rich fluids precipitate calcium fluoride. Fluorite deposits range from Precambrian to recent geologic age.

Uses & applications

Used industrially as a flux in steel and aluminum production and as a source of fluorine; attractive transparent specimens are collected and occasionally cut as gemstones, though fluorite is relatively soft.

Geological facts

Fluorite commonly fluoresces strongly under ultraviolet light, often blue, violet, or green. Its cubic cleavage and frequent color zoning are highly diagnostic.

Field identification & locations

Common localities include China, Mexico, England, the United States, and Namibia. Confirm with hardness testing, cleavage, cubic forms, and UV fluorescence; blue-green glass or resin imitations lack true cleavage.