Fluorite
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Mineral NameFluorite
Chemical FormulaCaF₂
Mohs Hardness4
Crystal Systemcubic
Lustervitreous
Streak Colorwhite
Cleavageperfect octahedral
Fractureconchoidal
Specific Gravity3.18
Colorsgreen, purple, blue, yellow, pink, colorless
Transparencytransparent
Type LocalityWeardale, Co. Durham, England
Mineral GroupHalides
Usesflux in steelmaking, hydrofluoric acid production, optical lenses, jewelry, collector specimens
Associated Mineralsquartz, calcite, barite, galena, sphalerite
Rarityuncommon
Description
This specimen features a cluster of dark green to bluish-green fluorite crystals, exhibiting their characteristic cubic habit.
Geological Context
Fluorite commonly forms in hydrothermal veins, often associated with metallic ore deposits, and can also be found in granites and pegmatites, precipitating from hot aqueous solutions.
