mineral
Raw pale-green crystal, likely fluorite
Fluorite (calcium fluoride, CaF₂)
AI-generated identification · may be incorrectUsually translucent pale green with vitreous luster and prominent cubic cleavage; Mohs hardness 4, cubic crystal system, specific gravity about 3.18. The irregular fragment appears cleaved rather than naturally crystal-faced, so identification is provisional from the image.
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Physical properties
Usually translucent pale green with vitreous luster and prominent cubic cleavage; Mohs hardness 4, cubic crystal system, specific gravity about 3.18. The irregular fragment appears cleaved rather than naturally crystal-faced, so identification is provisional from the image.
Formation & geological history
Forms mainly in hydrothermal veins and cavities, often with quartz, calcite, and sulfide minerals; deposits range from Paleozoic to recent geological ages. It is commonly associated with low-temperature mineralizing fluids.
Uses & applications
Used industrially as a flux in steel and aluminum production and as a source of hydrofluoric acid; attractive transparent pieces are collected or cut as gemstones, though relatively soft.
Geological facts
Green fluorite can resemble pale glass or calcite; unlike glass, it commonly shows flat cleavage surfaces and may fluoresce blue, purple, or green under ultraviolet light.
Field identification & locations
Common localities include China, Mexico, Mongolia, England, the United States, and Morocco. Confirm with a hardness test, cubic cleavage, density, and UV fluorescence; avoid scratching it with steel if preserving the specimen.
