thorianite
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tho·ri·a·nite
(thôr′ē-ə-nīt′)n.
A highly radioactive blackish, greenish, or yellow mineral, ThO2, isomorphous with uraninite.
thorianite
(ˈθɔːrɪəˌnaɪt)n
(Minerals) a rare black mineral consisting of thorium and uranium oxides. Formula: ThO2.U3O8
tho•ri•a•nite
(ˈθɔr i əˌnaɪt, ˈθoʊr-)n.
a rare, black, radioactive mineral, mainly thoria, ThO2, usu. found mixed with uranium, dioxide, and rare-earth metals: a minor source of thorium.