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Caption: Fluorite. Polished crystals of fluorite (also called fluorspar or fluor), a mineral composed mostly of calcium fluoride. Fluorite typically fluoresces blue under ultraviolet light. It can also emit light when heated (a property called thermoluminescence). Although this specimen is mostly colourless, fluorite can occur in many colours due to the presence of trace elements. A single specimen may display multiple colours. It is used in smelting metal and making glass, and in the chemical industry to manufacture hydrofluoric acid and fluoride compounds.

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Keywords: calcium fluoride, crystal, crystalline, crystals, cut, earth science, fluor, fluorescent, fluorite, fluorspar, geological, geology, mineral, polished, rock, therminoluminescent

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