Morton salt mine

Morton salt mine

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Credit: PETER MENZEL/SCIENCE PHOTO LIBRARY

Caption: A large pile of crushed rock salt at the Morton salt mine in America. Natural rock salt, also called halite, is mined in much the same way as coal and is usually marketed without purification, after crushing and screening. It occurs as bedded or domed deposits, believed to result from the evaporation of impounded sea water, in 28 states in the USA. Purity ranges from 97 percent for Kansas salt to 99 percent for Louisiana salt. The main impurities are calcium sulphate, dolomite, quartz, calcite and traces of iron oxides.

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Keywords: environment, geography, mine salt, rock salt, salt mine

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