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uraninite

[yoo-ran-uh-nahyt, -rey-nuh-] /yʊˈræn əˌnaɪt, -ˈreɪ nə-/
noun
1.
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
1875-1880
1875-80; uran(ium) + -in2 + -ite1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for uraninite

uraninite

/jʊˈrænɪˌnaɪt/
noun
1.
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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