A rare mineral having a velvet-black color and submetallic luster. It is a niobate of uranium, iron, and the yttrium and cerium metals.
Open English WordNet identifies the related term as a member, substance or component part.
Graphic granite. See under Granite.
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A rare mineral having a velvet-black color and submetallic luster. It is a niobate of uranium, iron, and the yttrium and cerium metals.
Open English WordNet identifies the related term as a member, substance or component part.
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