triplite

noun

trip·​lite

ˈtriˌplīt

plural -s

: a dark brown monoclinic basic phosphate of manganese, iron, magnesium, and calcium (Mn,Fe,Mg,Ca)₂(PO₄)(F,OH) generally with a fibrous massive structure

Word History

Etymology

German triplit, from tripl- + -it -ite; from its threefold cleavage

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