malladrite

noun

mal·​la·​drite

məˈläˌdrīt,

ˈmaləˌd-

plural -s

: a sodium fluosilicate Na₂SiF₆ occurring in minute hexagonal crystals in fumaroles in the crater of Vesuvius near Naples in Italy

Word History

Etymology

Italian, from Alessandro Malladra †1944 Italian geologist + Italian -ite

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