halite
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Halite. Credit: Mineral Information Institute
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Naturally occurring sodium chloride (common salt, NaCl) crystallizing in the cubic (isometric) system. Halite, also known as rock salt, is colorless or white (sometimes blue) when pure but may be colored pink, red, gray, or brown by the presence of impurities. It is often found in association with gypsum and anhydrite. Halite was named by E. F. Glocker in 1847 after the Greek hals, meaning "salt".
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