depinisyon kahulugan
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doc Definition of columbite
    English to English
    noun
  • a black mineral that is an ore of niobium and tantalum
  • source: WordNet 3.0
  • A mineral of a black color, submetallic luster, and high specific specific gravity. It is a niobate (or columbate) of iron and manganese, containing tantalate of iron; -- first found in New England.
  • source: Webster 1913
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