trigonite

noun

trigo·​nite

ˈtrīgəˌnīt,

ˈtrig-

plural -s

: a mineral MnPb₃H(AsO₃)₃ consisting of an acid lead manganese arsenite and occurring in yellow to brown triangular wedge-shaped crystals (hardness 2–3)

Word History

Etymology

German trigonit, from trigon- + -it -ite

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