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polyhalite

noun
poly·​halite | \-ˈhā-\
plural -s

Definition of polyhalite 

: 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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History and Etymology for polyhalite

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

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