mineral
Fluorite on matrix
Fluorite (CaF₂), likely on a pale quartz or calcite matrix
AI-generated identification · may be incorrectPurple, translucent to opaque fluorite crystals with vitreous luster and cubic form; Mohs hardness 4, perfect octahedral cleavage, specific gravity about 3.2. The pale matrix cannot be identified confidently from the image.
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Physical properties
Purple, translucent to opaque fluorite crystals with vitreous luster and cubic form; Mohs hardness 4, perfect octahedral cleavage, specific gravity about 3.2. The pale matrix cannot be identified confidently from the image.
Formation & geological history
Fluorite commonly crystallizes from hydrothermal fluids in veins and cavities, often alongside quartz or calcite. Its age depends on the deposit and cannot be determined from the image.
Uses & applications
Fluorite is used as an industrial flux and source of fluorine; attractive crystal-on-matrix specimens are collected and displayed.
Geological facts
Fluorite is cubic, but its perfect cleavage can produce octahedral fragments. Purple coloration may result from trace impurities or radiation-related defects.
Field identification & locations
Look for glassy purple cubic crystals and fluorite’s relatively low hardness; it can be scratched with a steel point. Fluorite occurs worldwide, including China, Mexico, England, and the United States.
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