polyhalite
noun
poly·halite
Definition of polyhalite
-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
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Origin and Etymology of polyhalite
German polyhalit, from poly- + hal- + -it -ite
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