langbeinite

noun

An evaporite mineral, K2Mg2(SO4)3, used as a source of potassium sulfate for fertilizer.

A potassium-magnesium sulphate (K2Mg2(SO4)3) occurring in colorless isometric crystals. It is found with rock-salt at various localities in Germany.

A saline evaporite, consisting of a mixed potassium and magnesium sulphate, with the chemical formula K2Mg2(SO4)3.

A mineral consisting of potassium magnesium double sulphate; used as a fertilizer.