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columbite

[kuh-luhm-bahyt] /kəˈlʌm baɪt/
noun
1.
a black, crystalline mineral, iron niobate, (Fe, Mn)Nb 2 O 6 , the principal ore of niobium, an end member of a series of solid solutions in which manganese and tantalum combine to form tantalite.
Origin of columbite
1795-1805
First recorded in 1795-1805; columb(ium) + -ite1
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for columbite

columbite

/kəˈlʌmbaɪt/
noun
1.
a black mineral consisting of a niobium oxide of iron and manganese in orthorhombic crystalline form: occurs in coarse granite, often with tantalite, and is an ore of niobium. Formula: (Fe, Mn)(Nb)2O6 Also called niobite
Word Origin
C19: from columbium + -ite1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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