Uraninite
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A mineral consisting chiefly of uranium oxide with some lead,thorium, etc., occurring in black octahedrons, also in masses with apitchlike luster; pitchblende.
Uraninite meaning & definition 1 of Uraninite.
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Uraninite is a radioactive, uranium-rich mineral and ore with a chemical composition that is largely uranium dioxide.
Uraninite meaning & definition 2 of Uraninite.