mineral
Green glass-like mineral specimen, likely fluorite
Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass
AI-generated identification · may be incorrectLikely translucent vivid green with vitreous luster and prominent cubic cleavage; fluorite has Mohs hardness 4 and specific gravity about 3.18. The strongly glassy, irregularly faceted appearance could alternatively be man-made glass, which is not geological.
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Physical properties
Likely translucent vivid green with vitreous luster and prominent cubic cleavage; fluorite has Mohs hardness 4 and specific gravity about 3.18. The strongly glassy, irregularly faceted appearance could alternatively be man-made glass, which is not geological.
Formation & geological history
Natural green fluorite forms in hydrothermal veins, commonly with quartz, calcite, and sulfide minerals, from relatively low-temperature mineralizing fluids. Important deposits occur in China, Mexico, England, Illinois, and other regions.
Uses & applications
Fluorite is used as a flux in steel and aluminum production, in hydrofluoric-acid manufacture, and as a collector/gemstone specimen; transparent pieces may be faceted. If glass, it has no geological formation or mineral value.
Geological facts
Fluorite commonly occurs as cubes and octahedra and can fluoresce strongly under ultraviolet light. Green color may result from trace rare-earth elements or radiation-related defects.
Field identification & locations
Check for natural cubic cleavage, crystal faces, internal zoning, and UV fluorescence; fluorite scratches glass only weakly, while glass commonly shows conchoidal fracture. A definitive identification requires hardness, density, and preferably Raman or laboratory testing.
