mineral

Green fluorite crystal

Fluorite, calcium fluoride (CaF₂)

AI-generated identification · may be incorrect

Pale green, translucent, with vitreous-to-pearly luster and prominent cubic cleavage; Mohs hardness 4, cubic crystal system, specific gravity about 3.18. The blocky stepped surfaces and green color are consistent with fluorite, though the photograph alone cannot exclude green calcite or feldspar.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins and cavities, commonly with quartz, barite, galena, and calcite; deposits range from Paleozoic to younger geological ages. Common localities include China, Mexico, England, Illinois and Kentucky (USA), Spain, and Morocco.

Uses & applications

Used industrially as a flux in steel and aluminum production and as a source of fluorine; transparent colorful crystals are popular collector specimens, but it is rarely used as a gemstone because of its softness.

Geological facts

Fluorite commonly fluoresces blue, violet, green, or cream under ultraviolet light, although not every specimen fluoresces. Its cubic cleavage is an especially diagnostic feature.

Field identification & locations

Check for cubic cleavage, relatively low hardness, and possible UV fluorescence; a steel knife may scratch it, while quartz will not. Identification should be confirmed by cleavage, hardness, and ideally chemical testing.