mineral
Rainbow fluorite crystal
Fluorite (calcium fluoride, CaF₂)
AI-generated identification · may be incorrectLikely a cleaved or shaped crystal showing purple and green color zoning; vitreous luster and cubic crystal structure. Hardness 4 Mohs, perfect octahedral cleavage, specific gravity about 3.18.
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Physical properties
Likely a cleaved or shaped crystal showing purple and green color zoning; vitreous luster and cubic crystal structure. Hardness 4 Mohs, perfect octahedral cleavage, specific gravity about 3.18.
Formation & geological history
Fluorite forms as a hydrothermal mineral in veins and cavities, commonly with quartz and metallic ores. The specimen’s age and exact locality cannot be determined from the image.
Uses & applications
Used as a source of fluorine in industry; clear, colorful pieces are collected or cut for decorative objects and jewelry, though its softness limits wearability.
Geological facts
Fluorite commonly occurs in striking color bands, and it fluoresces under ultraviolet light—an effect that inspired the term “fluorescence.”
Field identification & locations
Look for glassy luster, vivid color zoning, and cubic forms or cleavage; common sources include China, Mexico, England, and the United States.
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