钾盐镁矾
Kainite \Kai"nite\, n. [Gr. ? recent.] (Min.) A compound salt consisting chiefly of potassium chloride and magnesium sulphate, occurring at the Stassfurt salt mines in Prussian Saxony.
kainite n : a white mineral consisting of magnesium sulphate and potassium chloride; a source of potassium salts; used as a fertilizer