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pitchblende




pitchblende
Also called uraninite, a brown, black, or greenish mineral, the most important source of uranium, radium, and polonium. The composition of pitchblende varies between UO2 and UO2.6; thorium, lead, and helium are also present. Principal deposits are in Zaire, Bohemia, at Great Bear Lake, Canada, and in the Mountain States.


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   • GEOLOGY AND PLANETARY SCIENCE