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fluorite |
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fluoriteGlassy, brittle halide mineral, calcium fluoride CaF2, forming cubes and octahedra; colourless when pure, otherwise violet, blue, yellow, brown, or green. Fluorite is used as a flux in iron and steel making; colourless fluorite is used in the manufacture of microscope lenses. It is also used for the glaze on pottery, and as a source of fluorine in the manufacture of hydrofluoric acid. |
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