mineral
Fluorite
Fluorite (calcium fluoride, CaF₂)
AI-generated identification · may be incorrectTranslucent gray to pale blue-violet with vitreous luster and prominent cubic cleavage; Mohs hardness 4, cubic crystal system, specific gravity about 3.18. The specimen’s blocky, stepped faces are characteristic of fluorite cleavage.
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Physical properties
Translucent gray to pale blue-violet with vitreous luster and prominent cubic cleavage; Mohs hardness 4, cubic crystal system, specific gravity about 3.18. The specimen’s blocky, stepped faces are characteristic of fluorite cleavage.
Formation & geological history
Forms when fluorine-rich hydrothermal fluids fill fractures and cavities, often alongside quartz, calcite, or sulfide ores. Fluorite deposits occur in rocks of many ages; the image alone cannot establish this specimen’s age.
Uses & applications
Used as a flux in steelmaking, as a source of fluorine compounds, and in optical components; colorful pieces are also collected and occasionally cut as gemstones.
Geological facts
Fluorite commonly fluoresces under ultraviolet light, a phenomenon named after the mineral. Its softness and perfect cleavage make it vulnerable to scratching and breakage.
Field identification & locations
Look for cubic crystals or right-angled cleavage surfaces, relatively low hardness, and possible UV fluorescence; common deposits include China, Mexico, South Africa, and the United States.
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