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Potassium sulfate (K2SO4) (in British English potassium sulphate, also called sulphate of potash or archaically known as potash of sulfur) is a flammable white crystalline salt which is soluble in water. The chemical is commonly used in fertilizers, providing both potassium and sulfur. Potassium sulfate (K2SO4) has been known since early in the 14th century, and it was studied by Glauber, Boyle and Tachenius. In the 17th century it was named arcanuni or sal duplicatum, as it was a combination of an acid salt with an alkaline salt. The mineral form of potassium sulfate, namely arcanite, is relatively rare. Natural resources of potassium sulfate are minerals abundant in the Stassfurt salt. These are cocrystalisations of potassium sulfate and sulfates of magnesium calcium and sodium. The minerals are From some of the minerals like kainite, the potassium sulfate can be separated, because the corresponding salt is less soluble in water.
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