mineral

Blue-green fluorite (likely)

Fluorite, calcium fluoride (CaF₂)

AI-generated identification · may be incorrect

Pale blue to green, translucent, vitreous luster, commonly cubic cleavage; Mohs hardness 4 and specific gravity about 3.18. The rounded edges suggest a tumbled or naturally water-worn fragment.

Identified August 20, 2026More mineral →

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Physical properties

Pale blue to green, translucent, vitreous luster, commonly cubic cleavage; Mohs hardness 4 and specific gravity about 3.18. The rounded edges suggest a tumbled or naturally water-worn fragment.

Formation & geological history

Forms mainly in hydrothermal veins and cavities, often with quartz, calcite, and sulfide minerals; specimens range from Paleozoic to modern geologic settings. Color commonly results from trace impurities, radiation exposure, or lattice defects.

Uses & applications

Used industrially as a flux in steelmaking and as the primary source of fluorine and hydrofluoric acid; attractive pieces are collected or cut as decorative stones, though fluorite jewelry is relatively soft.

Geological facts

Fluorite may fluoresce strongly under ultraviolet light, often blue, violet, or green. Its diagnostic perfect octahedral cleavage distinguishes it from similarly colored glass or quartz.

Field identification & locations

Check for octahedral cleavage, moderate softness, and cubic internal zoning; a steel knife may scratch it, while quartz will not. Common localities include China, Mexico, England, Illinois, and Colorado.