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A black, red-brown, or colorless mineral, essentially (Fe, Mn)(Nb, Ta)2O6, the principal ore of niobium.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Minerals) 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
[C19: from columbium + -ite1]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(kəˈlʌm baɪt)

a black mineral, mainly iron niobate, (Fe, Mn)Nb2O6, the chief ore of niobium.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.columbite - a black mineral that is an ore of niobium and tantalum
atomic number 41, Nb, niobium - a soft grey ductile metallic element used in alloys; occurs in niobite; formerly called columbium
atomic number 73, Ta, tantalum - a hard grey lustrous metallic element that is highly resistant to corrosion; occurs in niobite and fergusonite and tantalite
mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical composition
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
He noted that the country prior to the discovery of oil and gas in commercial quantity was known for its tin, columbite, and coal.
The pegmatite fields of San Luis have an important past record of producing mica, beryl, spodumene, tantalite (tantalum oxide), columbite (niobium oxide), and recently potassium feldspar, albite and quartz.
Nigeria's present-day non-oil mineral resources can be broadly categorised into five groups: Industrial minerals (barite, kaolin, gypsum, feldspar and limestone); Energy minerals (such as bitumen, lignite and uranium); Metallic ore minerals (such as gold, cassiterite, columbite, iron ore, lead-zinc and copper); Construction minerals (such as granite, gravel, laterite and sand) and Precious stones (such as topaz, amethyst, tourmaline, sapphires, emeralds and garnets).
They work for Chinese company West African Polaris Ltd., which mines tin and columbite. Kidnappings of foreigners and locals are common all over Nigeria.
Primary exports include coal, tin, columbite, petroleum and rubber products, wood, hides and skins, textiles, cement and other construction materials, food products, footwear, chemicals, fertilizer, printing, ceramics and steel.
Columbite The principal deposits of columbite are found in the younger granites of Plateau, Bauchi.
This new boom, according to Garcia (2012), began in 2008, when mineral mixtures with high value for the production of electronic devices were discovered in the black soil of the department--e.g., columbite, tantalite and tungsten--which are the components of coltan.
Calcium metaniobate (Ca[Nb.sub.2][O.sub.6]) crystallizes with orthorhombic columbite structure in the space group of Pbcn(60) and is a strong source of coherent light which can be useful in applications of holography [1].
The polycrystalline samples of PZT-PMnN-PSN were synthesized by columbite precursor method.
In lieu of the above, magnetic and electrical geophysical techniques were used to identify the location and depth of formation of mineral rocks such as beryl, mica, feldspar, tourmaline, columbite, and tantalite in the study area.
Tantalum is primarily obtained from the minerals columbite ((Fe, Mn, Mg)[(Nb, Ta).sub.2][O.sub.6]), tantalite ((Fe, Mn)[(Ta, Nb).sub.2][O.sub.6]) and euxenite ((Y, Ca, Er, La, Ce, U, Th)[(Nb, Ta, Ti).sub.2][O.sub.6]).