|Color||colourless; yellow, brownish, greyish-green, red, violet, blue|
|Mohs scale hardness||2½-3|
Kainite (MgSO4·KCl·3H2O) is a mineral salt that consists of potassium chloride and magnesium sulfate and is used as a fertilizer. This mineral is dull and soft, is colored white through yellow to red and is found in the Stassfurt salt mines in Saxony, Germany. It is a natural salt occurring in irregular granular masses, and is used as a source of potassium and magnesium compounds.
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