mineral

Blue fluorite (likely rough specimen)

Fluorite, calcium fluoride (CaF₂)

AI-generated identification · may be incorrect

Typically purple-blue to blue with vitreous luster, cubic crystal structure, and perfect octahedral cleavage; Mohs hardness 4, specific gravity about 3.18. The specimen appears massive to crystalline, though the plastic obscures details.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and carbonate-hosted deposits, often with quartz, calcite, or barite; deposits range from Paleozoic to modern geological ages. Common sources include China, Mexico, England, the United States, and Mongolia.

Uses & applications

Used industrially as a flux in steel and aluminum production and as a source of hydrofluoric acid; attractive transparent pieces are cut as gemstones, while rough blue material is collected for display.

Geological facts

Blue fluorite coloration commonly results from trace elements, defects, or radiation effects and may fade with prolonged sunlight exposure. Fluorite is the reference mineral for Mohs hardness 4.

Field identification & locations

Identify by its cubic habit, octahedral cleavage, relatively low hardness, cool glassy luster, and possible fluorescence under ultraviolet light; do not rely on color alone. Typical common rough value is $5-$30, while larger vivid, well-crystallized specimens may sell for $50-$300+.