mineral

Green fluorite crystal

Fluorite (calcium fluoride, CaF₂)

AI-generated identification · may be incorrect

Pale green, translucent, and glassy with prominent cubic cleavage; Mohs hardness 4, specific gravity about 3.18, and commonly cubic crystal structure. The irregular broken surfaces and pale coloration are consistent with fluorite, though the photograph alone cannot exclude green calcite or glass.

Identified September 8, 2026More mineral →

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Physical properties

Formation & geological history

Fluorite forms from hydrothermal fluids in veins, cavities, and replacement deposits, often with quartz, calcite, and sulfide minerals. Deposits range from Paleozoic to modern geological ages.

Uses & applications

Used industrially as a flux in steelmaking and as the main source of fluorine; attractive transparent crystals are collected and occasionally cut as gemstones, though they are relatively soft.

Geological facts

Fluorite can fluoresce strongly under ultraviolet light, commonly blue, purple, green, or yellow. Its characteristic cleavage produces smooth octahedral fragments.

Field identification & locations

Test for cubic or octahedral cleavage, hardness near 4, and possible UV fluorescence; avoid scratching it with a steel blade unless necessary. Common localities include China, Mexico, Illinois, England, and Namibia.