mineral
Fluorite in matrix
Fluorite (CaF₂), likely with a pale quartz or calcite matrix
AI-generated identification · may be incorrectPurple fluorite patches occur in a cream-colored host rock. Fluorite has Mohs hardness 4, a glassy luster, cubic crystal structure, and perfect octahedral cleavage; the host cannot be identified confidently from the photo.
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Physical properties
Purple fluorite patches occur in a cream-colored host rock. Fluorite has Mohs hardness 4, a glassy luster, cubic crystal structure, and perfect octahedral cleavage; the host cannot be identified confidently from the photo.
Formation & geological history
Fluorite commonly crystallizes from hydrothermal fluids in veins and cavities, often alongside quartz or calcite. Its age depends on the deposit and cannot be determined from the specimen alone.
Uses & applications
Fluorite is used as an industrial flux and source of fluorine, and attractive crystals are collected or cut for display; this rough fragment appears primarily suited to collecting.
Geological facts
Fluorite is famously fluorescent under ultraviolet light, though not every specimen fluoresces.
Field identification & locations
Look for its vivid purple color and unusually easy cleavage; a copper coin should not scratch it, but a steel knife may. Fluorite occurs worldwide in hydrothermal deposits, including China, Mexico, and the United States.
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