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Answer for the clue "A source of potassium salts ", 7 letters:
kainite

Alternative clues for the word kainite

Word definitions for kainite in dictionaries

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 ...

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

Usage examples of kainite.

To the substances used for treating brewing liquors already mentioned we may add kainite, a naturally deposited composite salt containing potassium and magnesium sulphates and magnesium chloride.