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uraninite Line breaks: ur¦an¦in|ite
Pronunciation: /jʊˈranɪnʌɪt/

Definition of uraninite in English:


[mass noun]
A black, grey, or brown mineral which consists mainly of uranium dioxide and is the chief ore of uranium.
Example sentences
  • Arsenopyrite, cassiterite, molybdenite, wolframite, uraninite, and several of the common sulfides have all been observed at various locations.
  • Other accessory minerals are apatite, zircon, monazite, huttonite and rare xenotime, uraninite and betafite.
  • A comprehensive discussion of the mineralogy and occurrence of uraninite has been given by Frondel, to which the reader is strongly referred.


Late 19th century: from urano-2 + -ite1.

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