Found 2 items, similar to uraninite.
English → English (WordNet) Definition: uraninite uraninite n : 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 [syn: pitchblende]
English → English (gcide) Definition: Uraninite Uraninite \U*ran"i*nite\, n. (Min.) A mineral consisting chiefly of uranium oxide with some lead, thorium, etc., occurring in black octahedrons, also in masses with a pitchlike luster; pitchblende. [1913 Webster]