mineral
Fluorite
Fluorite (CaF2)
Hardness of 4 on the Mohs scale, typically green, purple, blue, yellow, or clear. It has a vitreous luster, isometric crystal system, perfect octahedral cleavage, and a specific gravity of around 3.18.
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Physical properties
Hardness of 4 on the Mohs scale, typically green, purple, blue, yellow, or clear. It has a vitreous luster, isometric crystal system, perfect octahedral cleavage, and a specific gravity of around 3.18.
Formation & geological history
Formed in hydrothermal veins, often associated with metallic ores like lead and zinc, as well as in cavities of carbonate rocks.
Uses & applications
Used in metallurgy as a flux, in the manufacturing of certain types of glass and enamels, for optical lenses, and as a popular gemstone and ornamental material for carvings and jewelry.
Geological facts
Fluorite gives fluorescence its name, as many specimens glow strongly under ultraviolet (UV) light due to impurities like yttrium or organic matter.
Field identification & locations
Easily identified by its relatively low hardness (can be scratched easily with a knife), perfect cleavage, and often vibrant multi-colored banding. Common localities include China, Mexico, South Africa, and the UK.
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