Columbite-tantalite Definition

kə-lŭmbīttăntə-līt
noun
A dull black aggregate of the minerals columbite and tantalite, mined primarily in central Africa as an ore for niobium and tantalum. It is also used to make nuclear reactor parts and electronic components in devices such as cell phones and DVD players.
American Heritage
Synonyms:
  • coltan

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