(n) 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, Syn.pitchblende
The Collaborative International Dictionary of English (GCIDE) v.0.53
n. (Chem.) An alkaline salt of fluorescein, obtained as a brownish red substance, which is used as a dye; -- so called from the peculiar yellowish green fluorescence (resembling that of uranium glass) of its solutions. See Fluorescein. [ 1913 Webster ]
n. (Min.) A mineral consisting chiefly of uranium oxide with some lead, thorium, etc., occurring in black octahedrons, also in masses with a pitchlike luster; pitchblende. [ 1913 Webster ]
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