mineral

Green fluorite crystal

Fluorite (calcium fluoride, CaF₂)

AI-generated identification · may be incorrect

Typically pale green with vitreous luster and cubic crystal structure; perfect octahedral cleavage, Mohs hardness 4, and specific gravity about 3.18. The specimen appears tumbled or roughly cut, so natural crystal faces may be modified.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and cavities, often with quartz, calcite, and sulfide minerals; deposits range from ancient Precambrian to younger Phanerozoic ages. Common 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 hydrofluoric acid; attractive transparent pieces are collected or cut as gemstones, though they are relatively soft.

Geological facts

Fluorite commonly fluoresces blue, purple, green, or cream under ultraviolet light, and its color may result from trace elements or radiation defects.

Field identification & locations

Identify it by its green color, glassy appearance, softness, cubic habit, and distinctive octahedral cleavage; a steel knife can scratch it. Common specimen value is about $5–$30, while exceptionally clear faceted or large crystal specimens may reach $50–$300+.