mineral
Tumbled green fluorite (probable)
Fluorite, calcium fluoride (CaF₂)
AI-generated identification · may be incorrectA small polished translucent green specimen with cloudy zoning and possible dark inclusions. Fluorite has Mohs hardness 4, vitreous luster, cubic crystal structure, perfect octahedral cleavage, and specific gravity about 3.18.
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Physical properties
A small polished translucent green specimen with cloudy zoning and possible dark inclusions. Fluorite has Mohs hardness 4, vitreous luster, cubic crystal structure, perfect octahedral cleavage, and specific gravity about 3.18.
Formation & geological history
Forms mainly in hydrothermal veins and cavity fillings, commonly with quartz, calcite, and sulfide minerals; its age depends on the deposit, ranging from Precambrian to recent geological periods.
Uses & applications
Used as a flux in steel and aluminum production, a source of hydrofluoric acid, and occasionally as a decorative or collectible stone. Faceted fluorite is used in inexpensive jewelry but is relatively soft.
Geological facts
Green fluorite commonly shows color zoning and fluorescence under ultraviolet light, though not every specimen fluoresces. The rounded surface indicates human tumbling or polishing.
Field identification & locations
Common localities include China, Mexico, Mongolia, Illinois and Kentucky, USA, and England. Confirm with a hardness test against a steel nail or glass cautiously; fluorite should scratch neither glass reliably nor quartz, and its cubic cleavage is diagnostic in rough material.
