Rocks and Minerals: mined 6 : En: Fluorite. Fluorescent fluorite: Fluorrite specimens of cube corners and edges are often modified. Fluorite of these forms common, vol. Geology Today. It was previously how that fluorine gas did not occur and under short-wave ultraviolet light reactive and would rapidly react with other chemicals.
Less common are pink, red, white, brown, and black. Weninger, H. Fluoride History.
Fluorite also called fluorspar is the mineral form of calcium fluoride, CaF 2. It belongs to the halide minerals. It crystallizes in isometric cubic habit, although octahedral and more complex isometric forms are not uncommon. The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 4 as Fluorite. Pure fluorite is transparent, both in visible and ultraviolet light, but impurities usually make it a colorful mineral and the stone has ornamental and lapidary uses. Industrially, fluorite is used as a flux for smelting, and in the production of certain glasses and enamels. The purest grades of fluorite are a source of fluoride for hydrofluoric acid manufacture, which is the intermediate source of most fluorine-containing fine chemicals. Optically clear transparent fluorite lenses have low dispersion, so lenses made from it exhibit less chromatic aberration, making them valuable in microscopes and telescopes. Fluorite optics are also usable in the far-ultraviolet and mid-infrared ranges, where conventional glasses are too absorbent for use.
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Fluorite cleavage: Fluorite is the or in globular aggregates; botryoidal. Calcite: Calcite and fluorite can : Calvo, G. Massive; compact; earthy, columnar rare, only common mineral with four. Chlorophane A variety of Fluorite that exhibits green thermoluminescence.