uraninite

[yoo-ran-uh-nahyt, -rey-nuh-]
noun
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:
1875–80; uran(ium) + -in2 + -ite1

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World English Dictionary
uraninite (jʊˈrænɪˌnaɪt)
 
n
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
 
[C19: see uranium, -in, -ite1]

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Example sentences
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.
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