mineral
Fluorite
Calcium Fluoride (CaF2)
Hardness of 4 on Mohs scale; vitreous luster; isometric crystal system featuring cubic habit; sharp octahedral cleavage; colors range from purple and blue to translucent grey/white; specific gravity around 3.18.
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Physical properties
Hardness of 4 on Mohs scale; vitreous luster; isometric crystal system featuring cubic habit; sharp octahedral cleavage; colors range from purple and blue to translucent grey/white; specific gravity around 3.18.
Formation & geological history
Forms via hydrothermal activity in veins alongside lead, zinc, and silver ores, or in pegmatites and limestone cavities where fluoride-bearing fluids precipitate.
Uses & applications
Used as a flux in steelmaking and smelting, production of hydrofluoric acid, optical lenses, ornamental carvings, and highly prized mineral collector specimens.
Geological facts
Fluorite glows under ultraviolet light, a phenomenon known as fluorescence, which was actually named after this mineral. It exhibits four direction perfect cleavage.
Field identification & locations
Identifiable by its distinct cubic crystal shapes, moderate softness (can be scratched with a steel nail), four cleavage directions, and vibrant translucency or purple tinting on matrix.
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