mineral

Polished green fluorite tower

Fluorite (calcium fluoride, CaF₂)

AI-generated identification · may be incorrect

Translucent pale green with cloudy zoning, vitreous luster, and a cut/polished prismatic form; hardness Mohs 4, cubic crystal system, perfect octahedral cleavage, and specific gravity about 3.18. The appearance could overlap with green calcite or jade, so confirmation requires testing.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Fluorite forms mainly in hydrothermal veins and carbonate-hosted deposits when fluorine-rich fluids precipitate calcium fluoride, commonly in Paleozoic to Mesozoic host rocks. Major sources include China, Mexico, Illinois and Kentucky (USA), England, and Spain.

Uses & applications

Used industrially as a flux in steelmaking and aluminum production and as a source of hydrofluoric acid; attractive translucent pieces are cut for décor, carvings, and inexpensive collector specimens.

Geological facts

Fluorite commonly fluoresces blue, purple, or green under ultraviolet light, though not every specimen does. Its perfect cleavage makes it prone to chipping, especially along octahedral planes.

Field identification & locations

Identify by its relatively soft surface, cubic/octahedral cleavage, density, and possible UV fluorescence; it should not scratch glass reliably. Green coloration and cloudy translucence can also indicate calcite, jade, or prehnite, requiring hardness, cleavage, and acid tests for certainty.