arfvedsonite

noun

arf·​ved·​son·​ite

ˈävə̇dsəˌnīt

plural -s

: a silicate of sodium, calcium, and iron, approximately Na_2–3(Fe, Mg, Al)₅Si₈O₂₂(OH)₂, of the amphibole group occurring in black monoclinic strongly pleochroic prisms in certain igneous rocks

Word History

Etymology

J. A. Arfvedson †1841 Swedish chemist + English -ite

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