mineral
Purple fluorite-bearing mineral specimen
Fluorite (calcium fluoride, CaF₂), possibly with quartz or chalcedony matrix
AI-generated identification · may be incorrectDark purple to violet, partly translucent areas with a vitreous-to-waxy luster and irregular fracture; fluorite is Mohs hardness 4, cubic in crystal structure, with perfect octahedral cleavage and specific gravity about 3.2. The rounded edges suggest a broken or lightly polished specimen.
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Physical properties
Dark purple to violet, partly translucent areas with a vitreous-to-waxy luster and irregular fracture; fluorite is Mohs hardness 4, cubic in crystal structure, with perfect octahedral cleavage and specific gravity about 3.2. The rounded edges suggest a broken or lightly polished specimen.
Formation & geological history
Fluorite forms mainly in hydrothermal veins and cavities, commonly with quartz, calcite, barite, or sulfide minerals; its age depends on the deposit, ranging from Paleozoic to recent geological settings.
Uses & applications
Used industrially as a flux in steelmaking and as a source of fluorine and hydrofluoric acid; transparent purple crystals are collectible and occasionally cut as gemstones, though relatively soft.
Geological facts
Purple coloration commonly results from radiation-related color centers or trace-element defects. Color zoning and cubic cleavage are characteristic, but they are not clearly visible here.
Field identification & locations
Common localities include China, Mexico, Illinois and Kentucky (USA), England, Spain, and Morocco. Confirm with a hardness test, cleavage, cubic crystal habit, and specific gravity; avoid scratching valuable specimens.
