mineral

Blue-green fluorite crystal

Fluorite (calcium fluoride, CaF₂)

AI-generated identification · may be incorrect

Translucent blue-green specimen with vitreous luster and apparent cubic cleavage; fluorite has Mohs hardness 4, cubic crystal structure, and specific gravity about 3.18. The shape and color are consistent with a rough or partially polished fluorite fragment.

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and replacement deposits, commonly with quartz, calcite, and sulfide minerals; individual crystals may be geologically young relative to their host rocks. Major sources include China, Mexico, England, Spain, and the United States.

Uses & applications

Used industrially as a flux in steel and aluminum production and as a source of fluorine; transparent colorful material is collected or cut into decorative objects and occasional gemstones.

Geological facts

Fluorite commonly fluoresces under ultraviolet light, often blue, purple, green, or yellow. Its perfect octahedral cleavage makes sharp breaks and helps distinguish it from harder glass or quartz.

Field identification & locations

Check for cubic or octahedral cleavage, relatively low hardness, and possible UV fluorescence; avoid confusing it with blue-green glass or calcite. Value is typically $5-$30 for a small common specimen, or $50-$200+ for vivid, well-formed crystals.