Definition of arfvedsonite
: a silicate of sodium, calcium, and iron, approximately Na2–3(Fe, Mg, Al)5Si8O22(OH)2, of the amphibole group occurring in black monoclinic strongly pleochroic prisms in certain igneous rocks
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Origin and Etymology of arfvedsonite
J. A. Arfvedson †1841 Swedish chemist + English -ite
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