mineral

Polished blue-green fluorite

Fluorite (calcium fluoride, CaF₂)

AI-generated identification · may be incorrect

Likely hardness 4 Mohs; translucent blue-green color, vitreous luster, cubic crystal structure, and perfect octahedral cleavage. The smoothly cut/polished surface and internal zoning are visible; exact identification would require testing.

Identified September 7, 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 crystallize in fractures, commonly during the Paleozoic–Mesozoic. Major sources include China, Mexico, Mongolia, England, and the United States.

Uses & applications

Used as a flux in steel and aluminum production, a source of hydrofluoric acid, and as decorative polished material; transparent, vividly colored pieces are collectible. It is generally too soft for durable everyday jewelry.

Geological facts

Blue-green fluorite commonly shows color zoning and fluorescent responses under ultraviolet light, though fluorescence is not diagnostic. Its cubic cleavage makes it vulnerable to chipping.

Field identification & locations

Identify by its cubic zoning, glassy luster, softness, and octahedral cleavage; it should scratch with a steel knife but not glass. Confirm with hardness, cleavage, specific gravity, and ideally Raman/XRF testing.