langbeinite
nounAn evaporite mineral, K2Mg2(SO4)3, used as a source of potassium sulfate for fertilizer.
nounA potassium-magnesium sulphate (K2Mg2(SO4)3) occurring in colorless isometric crystals. It is found with rock-salt at various localities in Germany.
nounA
a mineral consisting of potassium magnesium double sulphate; used as a fertilizer