URANINITE
uraninite, pitchblende
(noun) a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore
Source: WordNet® 3.1
Etymology
Noun
uraninite (plural uraninites)
(mineral) Any of several brownish-black forms of uranium dioxide, UO2, (especially pitchblende) that is the chief ore of uranium; it is isomorphous with thorianite.
Source: Wiktionary
U*ran"i*nite, n. (Min.)
Definition: A mineral consisting chiefly of uranium oxide with some lead,
thorium, etc., occurring in black octahedrons, also in masses with a
pitchlike luster; pitchblende.
Source: Webster’s Unabridged Dictionary 1913 Edition