mineral
Green fluorite rough specimen
Fluorite (calcium fluoride, CaF₂)
AI-generated identification · may be incorrectPale green, translucent-to-cloudy crystal with a vitreous luster; Mohs hardness 4 and cubic crystal structure, typically with perfect octahedral cleavage. The image alone cannot confirm the identification; green calcite or other minerals can look similar.
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Physical properties
Pale green, translucent-to-cloudy crystal with a vitreous luster; Mohs hardness 4 and cubic crystal structure, typically with perfect octahedral cleavage. The image alone cannot confirm the identification; green calcite or other minerals can look similar.
Formation & geological history
Forms when fluorine-rich hydrothermal fluids deposit crystals in veins and cavities, often alongside quartz or sulfides. Fluorite occurs in rocks of many geological ages.
Uses & applications
Used as a flux in steelmaking, in chemical production, and as ornamental or collectible material; clear, attractive pieces may be cut as gems.
Geological facts
Fluorite is the reference mineral for Mohs hardness 4 and can fluoresce under ultraviolet light.
Field identification & locations
Check for softness, cubic cleavage, and—on a small inconspicuous spot—effervescence in dilute acid to distinguish calcite. Common sources include China, Mexico, the United States, and England.
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