mineral
Purple fluorite crystal
Fluorite (calcium fluoride, CaF₂)
AI-generated identification · may be incorrectTypically purple with vitreous luster and cubic crystal structure; perfect octahedral cleavage, Mohs hardness 4, and specific gravity about 3.18. The specimen appears to be a small, partly translucent purple cubic crystal.
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Physical properties
Typically purple with vitreous luster and cubic crystal structure; perfect octahedral cleavage, Mohs hardness 4, and specific gravity about 3.18. The specimen appears to be a small, partly translucent purple cubic crystal.
Formation & geological history
Forms mainly in hydrothermal veins and cavities associated with limestone, dolostone, and metal-bearing deposits. Most specimens are geologically young on Earth’s timescale, commonly associated with Paleozoic–Mesozoic mineralizing events.
Uses & applications
Used industrially as a flux in steel and aluminum production and as a source of fluorine; transparent, vividly colored crystals are collected and occasionally cut as gemstones.
Geological facts
Purple coloration commonly results from irradiation-related color centers and trace impurities. Fluorite is a major source mineral for hydrofluoric acid and fluoresces strongly under some ultraviolet light.
Field identification & locations
Identify it by its purple color, cubic form, glassy luster, softness, and distinctive octahedral cleavage; it is easily scratched by a steel knife. Common localities include China, Mexico, England, Illinois, Colorado, and New Mexico.
