mineral

Polished fluorite cabochon

Fluorite (calcium fluoride, CaF₂)

AI-generated identification · may be incorrect

Likely translucent green-to-purple fluorite with zoning and internal cleavage features; vitreous luster, cubic crystal structure, perfect octahedral cleavage, Mohs hardness 4, and specific gravity about 3.18. The teardrop form is cut and polished, not natural crystal shape.

Identified August 22, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and carbonate-hosted deposits, commonly with quartz, calcite, and sulfide minerals. Fluorite deposits range from Paleozoic to younger geological ages; the exact age and locality cannot be determined from the image.

Uses & applications

Used industrially as a flux in steelmaking and aluminum production, and as a source of hydrofluoric acid; transparent colorful material is cut for cabochons and carvings.

Geological facts

Fluorite commonly fluoresces blue, purple, green, or cream under ultraviolet light. Its cubic cleavage and relatively low hardness make it prone to scratches and chipping.

Field identification & locations

Identify by vivid zoning, glassy luster, moderate weight, hardness near 4, and octahedral cleavage; avoid testing a finished piece destructively. Similar green fluorite, glass, and some varieties of prehnite can look alike.