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(named after the German geologist R. von Car-nall, 1804–74), a mineral, a complex hydrated chloride of magnesium and potassium with composition KCl -MgCl2’6H2O. It usually also has insignificant amounts of Br, Li, Rb, Cs, and mechanical particles of clay minerals, hematite, and hydrated oxides of iron. Carnallite crystallizes in the orthorhombic system and usually forms granular aggregates with halite, sylvite, and other salt deposit minerals. It is colorless or tinted murky brown, reddish pink, and other colors as a result of impurities contained in it. Carnallite is hygroscopic and characterized by a bitter salty burning taste. Its hardness on the mineralogical scale is 2–3; it has a density of 1, 600 kg/m3. It is one of the principal minerals in potassium salt deposits. The largest deposit in the USSR is at Solikamsk in the Urals. Major deposits abroad are found in the German Democratic Republic (Stassfurt, Aschersleben), the Federal Republic of Germany, the United States, and Tunisia.