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sillenite

noun
sil·​len·​ite | \ ˈsiləˌnīt\
plural -s

Definition of sillenite

: a mineral Bi2O3 that consists of a native bismuth oxide in earthy masses and that is polymorphous with bismite

History and Etymology for sillenite

L. G. Sillén, 20th century Swedish mineralogist + English -ite

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