mineral

Blue fluorite crystal

Fluorite (calcium fluoride, CaF₂)

AI-generated identification · may be incorrect

Typically cubic crystal structure with perfect octahedral cleavage; Mohs hardness 4, vitreous luster, and blue-to-violet translucent color. The specimen appears cut or naturally cubic, though its dark color and surface reflections limit certainty from the image.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal veins and cavities associated with limestone, dolostone, and igneous rocks, commonly during relatively low-temperature mineralization. Its exact geological age and locality cannot be determined visually.

Uses & applications

Used as a flux in steel and aluminum production, in hydrofluoric-acid manufacture, and as an ornamental or collecting mineral; transparent material is occasionally faceted as a gemstone.

Geological facts

Fluorite commonly fluoresces blue, violet, green, or cream under ultraviolet light, and its name derives from its historical use as a metallurgical flux.

Field identification & locations

Identify it by cubic habit, strong cleavage, moderate softness, and possible UV fluorescence; distinguish it from glass by its cleavage and scratchability. Major sources include China, Mexico, the United States, England, and Morocco.