wolframite

noun
wol·​fram·​ite | \ˈwu̇l-frə-ˌmīt \

Definition of wolframite 

: a brown to black mineral consisting of a tungstate of iron and manganese occurring especially in monoclinic crystals and used as a source of tungsten

First Known Use of wolframite

circa 1868, in the meaning defined above

History and Etymology for wolframite

German Wolframit, from Wolfram

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The first known use of wolframite was circa 1868

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Britannica.com: Encyclopedia article about wolframite

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