polyhalite

noun

poly·​halite

-ˈhā-

plural -s

: a mineral K₂MgCa₂(SO₄)₄.2H₂O occurring usually in fibrous masses of a brick-red color due to iron but consisting essentially of hydrous sulfate of calcium, magnesium, and potassium

Word History

Etymology

German polyhalit, from poly- + hal- + -it -ite

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