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n. A massive variety of the mineral uraninite.

n. Naturally-occurring uranium oxide, a variety of the mineral uraninite.

n. A pitch-black mineral consisting chiefly of the oxide of uranium; uraninite. See uraninite.

n. An oxid of uranium, usually occurring in pitchy black masses, rarely in octahedrons. Also pechblend, pechblende, pechurane, uraninite.

n. It is a black mineral found chiefly in the mines of the Erzgebirge, between Saxony and Bohemia, and until recently known simply as the chief source of oxid of uranium, used in staining glass and painting on porcelain. In it have been found many of the substances which have been observed to present the property of radioactivity.

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

"In a waste ore called pitchblende, a black sludge that came from the peaty forests of Joachimsthal in what is now the Czech Republic, the Curies found the first signal of a new element—an element many times more radioactive than uranium."

uranium ore   

joachimsthal pitchblende   

uraninite   

bauxite    classicrock    checkable    high-cantled    pig iron    palynomorph    cord-wood    ryetalyn    selenocysteine    good-faith