mineral

Blue-green fluorite (rough fragment)

Fluorite, calcium fluoride (CaF₂)

AI-generated identification · may be incorrect

Translucent blue-green color with a glassy luster and blocky fracture. Mohs hardness 4; cubic crystal system and perfect octahedral cleavage, though crystal faces are not clear in this fragment.

Identified October 16, 2026More mineral →

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Physical properties

Translucent blue-green color with a glassy luster and blocky fracture. Mohs hardness 4; cubic crystal system and perfect octahedral cleavage, though crystal faces are not clear in this fragment.

Formation & geological history

Forms when hot, mineral-rich fluids deposit calcium fluoride in veins, often alongside quartz, calcite, or sulfide ores. Fluorite occurs in rocks of many ages; the specimen’s age and locality cannot be determined from the image.

Uses & applications

Used as a flux in steelmaking, as a source of fluorine chemicals, and as a decorative or collectible mineral; softer than most jewelry stones.

Geological facts

Fluorite commonly occurs in vivid colors and may fluoresce under ultraviolet light, a property named after the mineral.

Field identification & locations

The blue-green color and glassy, somewhat blocky fragment are consistent with fluorite, but color alone is not diagnostic. Check for hardness near 4 and cleavage; common sources include China, Mexico, South Africa, and the United States.