wolframite

noun

wol·​fram·​ite ˈwu̇l-frə-ˌmīt 

: 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

Word History

Etymology

German Wolframit, from Wolfram

First Known Use

circa 1868, in the meaning defined above

Kids Definition

wolframite

noun

wol·​fram·​ite ˈwu̇l-frə-ˌmīt 

: a brownish or grayish black mineral that contains tungsten in combination with iron, manganese, and oxygen and that is used as a source of tungsten