Used as a fertilizer

• A source of potassium salts
• A white mineral consisting of magnesium sulphate and potassium chloride

WordNet Word definitions in WordNet
n. a white mineral consisting of magnesium sulphate and potassium chloride; a source of potassium salts; used as a fertilizer

Wiktionary Word definitions in Wiktionary
n. (context mineralogy English) A saline evaporite, consisting of magnesium sulphate and potassium chloride with the chemical formula magnesiumsulfuroxygen 4 '''·'''potassiumchlorine'''·'''3water, found in German salt mines.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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.

Wikipedia Word definitions in Wikipedia
Kainite (KMg(SO)Cl·3HO) is an evaporite mineral in the class of "Sulfates (selenates, etc.) with additional anions, with HO" according to the Nickel-Strunz classification . It is a hydrated potassium-magnesium sulfate-chloride, naturally occurring in irregular ...