ca·top·trite noun orka·top·trite\kəˈtäpˌtrīt, ˈkad.əpˌ-\ (-s) Etymology: Swedish katoptrit, from Greek katoptron + Swedish -it -ite; from its mirrorlike cleavage surfaces : a mineral consisting of a silico-antimonate of manganese, aluminum, magnesium, and iron occurring in metallic black monoclinic crystals