from The Century Dictionary and Cyclopedia
- Noting a dark green oxid of uranium, of sp. gr. 7.2 or 7.3, and having the composition of uranyluranate, U3O8 or UO2.2UO3 or (UO2)2UO4. It is one of the principal constituents of the mineral uraninite or pitchblende, though the proportions of uranium and oxygen vary widely in specimens from different localities.
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