mineral
Tumbled rainbow fluorite
Fluorite (calcium fluoride, CaF₂)
AI-generated identification · may be incorrectLikely a polished fluorite pebble with pale purple, blue-green, and clear zones. Fluorite has Mohs hardness 4, a vitreous luster, cubic crystal structure, and perfect octahedral cleavage; color and identity cannot be confirmed from the image alone.
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Physical properties
Likely a polished fluorite pebble with pale purple, blue-green, and clear zones. Fluorite has Mohs hardness 4, a vitreous luster, cubic crystal structure, and perfect octahedral cleavage; color and identity cannot be confirmed from the image alone.
Formation & geological history
Forms when fluoride-rich hydrothermal fluids crystallize in veins and cavities, often alongside quartz and calcite. Fluorite deposits occur in rocks of many ages.
Uses & applications
Used as a source of fluorine in industry and as an ornamental or collectible mineral; softer pieces are commonly tumbled and polished.
Geological facts
Fluorite is notably fluorescent under ultraviolet light, a property that inspired the term fluorescence.
Field identification & locations
Look for vivid color zoning and, on an unpolished sample, cubic crystals or octahedral cleavage; it is commonly mined in China, Mexico, South Africa, and the United States. Similar-looking polished minerals may be difficult to distinguish visually.
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Mineral