mineral
Polished fluorite
Fluorite (calcium fluoride, CaF₂)
AI-generated identification · may be incorrectMohs hardness 4; translucent, pale blue-gray with a deep purple zone and vitreous luster. Cubic crystal structure; perfect octahedral cleavage, though polishing obscures it.
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Physical properties
Mohs hardness 4; translucent, pale blue-gray with a deep purple zone and vitreous luster. Cubic crystal structure; perfect octahedral cleavage, though polishing obscures it.
Formation & geological history
Forms in hydrothermal veins and cavities, often alongside quartz, calcite, and sulfide minerals. Fluorite deposits occur in rocks of many ages; the specimen’s age and locality cannot be determined from the image.
Uses & applications
Used as a source of fluorine in chemical and metallurgical industries; attractive colored material is polished for ornaments, jewelry, and collections.
Geological facts
Fluorite commonly shows vivid color zoning and fluoresces under ultraviolet light, a property named after the mineral.
Field identification & locations
The purple-and-pale zoning and polished surface suggest fluorite; confirm by its relatively low hardness and octahedral cleavage. Important localities include China, Mexico, England, and Illinois, USA.
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