mineral
Likely blue-gray fluorite
Fluorite (calcium fluoride, CaF₂)
AI-generated identification · may be incorrectTranslucent gray-blue to violet, with a vitreous luster and prominent cleavage planes; Mohs hardness 4, cubic crystal system, specific gravity about 3.2. The image suggests fluorite, but identification from appearance alone is uncertain.
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Physical properties
Translucent gray-blue to violet, with a vitreous luster and prominent cleavage planes; Mohs hardness 4, cubic crystal system, specific gravity about 3.2. The image suggests fluorite, but identification from appearance alone is uncertain.
Formation & geological history
Forms when mineral-rich fluids fill fractures and cavities, commonly in hydrothermal veins; deposits range from ancient to geologically recent.
Uses & applications
Used as a flux in steelmaking and as a source of fluorine; transparent, colorful crystals are collected and sometimes cut for jewelry.
Geological facts
Fluorite commonly fluoresces under ultraviolet light, a property named after the mineral.
Field identification & locations
Look for cubic crystals or cleavage fragments that scratch easily with a steel knife; common localities include China, Mexico, England, and the United States.
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