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[yoo-ran-uh-nahyt, -rey-nuh-] /yʊˈræn əˌnaɪt, -ˈreɪ nə-/
a mineral, probably originally uranium dioxide, UO 2 , but altered by radioactive decay, and usually containing uranium trioxide, lead, radium, and helium, occurring in several varieties, including pitchblende: the most important ore of uranium.
Origin of uraninite
1875-80; uran(ium) + -in2 + -ite1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for uraninite
  • If you have a piece of uraninite, you can hold a neutrino source right in your hand.
  • uraninite and fullerene in atmospheric particulates.
  • However, secondary minerals can contribute to the long-term stability of biogenic uraninite by slowing the reoxidation process.
British Dictionary definitions for uraninite


a blackish heavy radioactive mineral consisting of uranium oxide in cubic crystalline form together with radium, lead, helium, etc: occurs in coarse granite. Formula: UO2
Word Origin
C19: see uranium, -in, -ite1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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