catoptrite

noun

ca·​top·​trite

variants or katoptrite

kəˈtäpˌtrīt,

ˈkatəpˌ-

plural -s

: a mineral consisting of a silico-antimonate of manganese, aluminum, magnesium, and iron occurring in metallic black monoclinic crystals

Word History

Etymology

Swedish katoptrit, from Greek katoptron + Swedish -it -ite; from its mirrorlike cleavage surfaces

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