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/jʊˈɹeɪnɪnaɪt/ · noun
(mineralogy) Any of several brownish-black forms of uranium dioxide, UO₂, (especially pitchblende) that is the chief ore of uranium; it is isomorphous with thorianite..
Use uraninite when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Uraninite means (mineralogy) Any of several brownish-black forms of uranium dioxide, UO₂, (especially pitchblende) that is the chief ore of uranium; it is isomorphous with thorianite..
Common synonyms include pitchblende.
The opposite depends on the specific sense.
Use uraninite where its definition matches the intended context.
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