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Definisi 'columbite'
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English to English noun
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a black mineral that is an ore of niobium and tantalum |  | source: wordnet30
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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: webster1913
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