catoptrite

noun
ca·​top·​trite
variants: or katoptrite \kəˈtäpˌtrīt, ˈkatəpˌ-​ \
plural -s

Definition of catoptrite 

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

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History and Etymology for catoptrite

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

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