mineral
Green and purple fluorite
Fluorite (calcium fluoride, CaF₂)
AI-generated identification · may be incorrectTranslucent pale-green and purple crystal with vitreous luster; Mohs hardness 4, cubic crystal system, and perfect octahedral cleavage. The specimen appears rough and naturally fractured.
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Physical properties
Translucent pale-green and purple crystal with vitreous luster; Mohs hardness 4, cubic crystal system, and perfect octahedral cleavage. The specimen appears rough and naturally fractured.
Formation & geological history
Fluorite commonly crystallizes from hydrothermal fluids in veins and cavities, often alongside quartz and calcite. Its exact age and locality cannot be determined from the image.
Uses & applications
Used as a flux in metalworking and as a source of fluorine; attractive material is cut for jewelry or collected as a mineral specimen.
Geological facts
Fluorite can show multiple colors in a single crystal, and its characteristic fluorescence under ultraviolet light gave fluorescence its name.
Field identification & locations
Look for glassy surfaces, relatively low hardness, and cleavage into smooth octahedral faces; common deposits occur in China, Mexico, and the United States. The pictured pale-green and purple zoning is consistent with fluorite.
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