uraninite :

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  • 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

  • With many such "ifs" Professor Lane estimates the present age of uraninite as 1,070,000,000 years, of pitchblende as 1,300,000,000 years.

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