pitchblende
 oxford
 views  updated May 23 2018pitch·blende  / ˈpichˌblend/ •
n. a form of the mineral uraninite occurring in brown or black pitchlike masses.
 The Oxford Pocket Dictionary of Current English 
   pitchblende
 oxford
 views  updated May 23 2018pitchblende (min.) native oxide of uranium. XVIII. -G. 
pechblende, f. 
pech PITCH1; see 
BLENDE.
  The Concise Oxford Dictionary of English Etymology T. F. HOAD
   pitchblende
 oxford
 views  updated May 08 2018pitchblende See 
URANINITE.
  A Dictionary of Earth Sciences AILSA ALLABY and MICHAEL ALLABY