mineral

Green-blue fluorite specimen

Fluorite (calcium fluoride, CaF₂)

AI-generated identification · may be incorrect

Typically translucent green, blue, or purple with vitreous luster; Mohs hardness 4, cubic crystal structure, and perfect octahedral cleavage. The specimen appears massive to coarsely crystalline, with prominent cleavage faces and matrix attached.

Identified September 4, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and replacement deposits, commonly with quartz, calcite, barite, and sulfide minerals; its age depends on the deposit, ranging from Paleozoic to recent geologic settings. Common sources include China, Mexico, Illinois/Kentucky, England, Spain, and Morocco.

Uses & applications

Used industrially as a flux in steel and aluminum production and as a source of fluorine; transparent, vividly colored crystals are popular collector specimens, though this rough piece is not typically gem-grade.

Geological facts

Fluorite often fluoresces strongly under ultraviolet light, commonly blue, purple, green, or cream. Its cubic cleavage and relatively low hardness distinguish it from many similarly colored green minerals.

Field identification & locations

Identify by testing hardness against a steel knife or glass cautiously, checking cubic/octahedral cleavage, and using UV light; avoid scratching valuable faces. Estimated value: about $20-$150 for a common rough specimen, potentially $200-$1,000+ if color, clarity, size, locality, or fluorescence is exceptional.