mineral

Blue-green fluorite (likely)

Fluorite, calcium fluoride (CaF₂)

AI-generated identification · may be incorrect

Translucent blue-green, vitreous luster, commonly cubic cleavage; Mohs hardness 4 and specific gravity about 3.18. The rough specimen shows irregular fracture and possible brown matrix or iron staining.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms when fluorine-rich hydrothermal fluids fill veins and cavities, often with quartz, calcite, or sulfides; deposits range from Paleozoic to Cenozoic in age. Exact locality cannot be determined from the photograph.

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 fluorite is relatively soft.

Geological facts

Blue-green fluorite commonly owes its color to trace elements and radiation-related defects. Color, cleavage, and hardness distinguish it from similarly colored glass or calcite.

Field identification & locations

Look for distinct cubic cleavage, cool glassy luster, and scratching by a steel knife while not scratching ordinary glass reliably; confirm with a hardness, cleavage, and specific-gravity test. Common sources include China, Mexico, the United States, England, and Mongolia.