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franklinite

noun
frank·​lin·​ite | \ ˈfraŋkləˌnīt\
plural -s

Definition of franklinite

: an iron-black slightly magnetic mineral ZnFe2O4 consisting of an oxide of iron and zinc occurring in octahedral crystals or massive and constituting a member of the magnetite series

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History and Etymology for franklinite

Franklin, New Jersey + English -ite

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