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A complex brownish-black mineral, UO2, forming the chief ore of uranium and containing variable amounts of radium, lead, thorium, and other elements. It is isomorphous with thorianite.
[German Uranin (from New Latin ūranium, uranium; see uranium) + -ite.]
(Minerals) 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]
u•ran•i•nite(yʊˈræn əˌnaɪt, -ˈreɪ nə-)
a radioactive mineral, uranium dioxide, UO2, usu. found mixed with its decay products: the primary ore of uranium.
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|Noun||1.||uraninite - 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|
atomic number 92, uranium, U - a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
uranium ore - any ore from which uranium can be extracted