mineral

Raw fluorite (probable)

Fluorite, calcium fluoride (CaF₂)

AI-generated identification · may be incorrect

Pale gray-green, translucent, with glassy luster and prominent cubic cleavage; Mohs hardness 4, cubic crystal system, and specific gravity about 3.18. The blocky fractured appearance and color are consistent with fluorite, though calcite or quartz cannot be excluded from a photograph alone.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and carbonate-hosted deposits when fluorine-rich fluids circulate through fractures; deposits range from Paleozoic to much younger ages. Common localities include China, Mexico, England, the United States, and Namibia.

Uses & applications

Used industrially as a flux in steel and aluminum production and as a source of hydrofluoric acid; attractive transparent pieces are cut as gemstones or sold as specimens. This small rough piece is typically worth about $2–$15.

Geological facts

Fluorite commonly fluoresces strongly under ultraviolet light, often blue, violet, green, or yellow. Its cubic cleavage is a key diagnostic feature, and color zoning is frequent.

Field identification & locations

Check for cubic cleavage, relatively low hardness, and possible UV fluorescence; it should scratch with a steel knife but not ordinary glass. A hardness, cleavage, streak, or UV test would help distinguish it from calcite and quartz.