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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