PITCHBLENDE
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
pitchblende (plural pitchblendes)
(mineral) Naturally-occurring uranium oxide, a variety of the mineral uraninite.
Source: Wiktionary
Pitch"blende`, n. Etym: [1st pitch + blende.] (Min.)
Definition: A pitch-black mineral consisting chiefly of the oxide of
uranium; uraninite. See Uraninite.
Source: Webster’s Unabridged Dictionary 1913 Edition