mineral

Blue-green fluorite (rough crystal)

Fluorite, calcium fluoride (CaF₂)

AI-generated identification · may be incorrect

The specimen appears pale blue-green and translucent, with blocky cleavage surfaces. Fluorite has Mohs hardness 4, a vitreous luster, and cubic crystal structure; color and identity cannot be confirmed from the image alone.

Identified September 23, 2026More mineral →

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Physical properties

Formation & geological history

Fluorite commonly crystallizes from hydrothermal fluids in veins and cavities, often with lead-zinc ores. It forms in many geological periods; the specimen’s age and locality are unknown.

Uses & applications

Used as a flux in steelmaking, in chemical production, and as a decorative or collecting mineral; transparent pieces may be faceted for jewelry, though they scratch easily.

Geological facts

Fluorite has four perfect cleavage directions, producing characteristic octahedral fragments, and often fluoresces under ultraviolet light.

Field identification & locations

Look for glassy luster, cubic forms, and easy scratching with a steel knife; common sources include China, Mexico, the United States, and England. A hand-sized rough specimen like this typically sells for about $5–$30, depending on color, clarity, and locality.