Uraninite

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]



From WordNet (r) 2.0 [wn]:

  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}]