columbite


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co·lum·bite

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

columbite

(kəˈlʌmbaɪt)
n
(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]

co•lum•bite

(kəˈlʌm baɪt)

n.
a black mineral, mainly iron niobate, (Fe, Mn)Nb2O6, the chief ore of niobium.
[1795–1805]
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
References in periodicals archive ?
Enrichment of scandium also occurs in aluminum phosphate minerals, beryl, cassiterite, columbite, garnet, muscovite, rare-earth minerals, and wolframite.
Tantalum is primarily obtained from the minerals columbite ((Fe, Mn, Mg)[(Nb, Ta).
Despite vast extractive resources including diamonds, chromite, and reserves of rutile that are among the world's largest, along with bauxite, columbite and gold, the country has consistently ranked among the least developed in the UNDP Human Development Index and is one of the poorest, with a per capita income of about US $700 (at official exchange rates) and one of the world's most unequal income distributions, with a Gini Index of 66.
This residue is largely comprised of zircon (zirconium silicate) and columbite (niobium and tantalum mineral) along with any silicate gangue minerals that have not broken down during the acid bake process.
Natural resources: Oil and natural gas (37% of 2006 GDP), tin, columbite, iron ore, coal, limestone, lead, zinc.