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A black mineral that is an ore of niobium and tantalum
Answer for the clue "A black mineral that is an ore of niobium and tantalum ", 9 letters:
columbite
Word definitions for columbite in dictionaries
Wiktionary
Word definitions in Wiktionary
n. (context mineral English) A black mineral that is a mixed iron and manganese niobate and tantalate, and is the main ore of niobium and tantalum.
Wikipedia
Word definitions in Wikipedia
Columbite , also called niobite , niobite-tantalite and columbate [( Fe , Mn ) Nb O ], is a black mineral group that is an ore of niobium . It has a submetallic luster and a high density and is a niobate of iron and manganese . This mineral group was first ...
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Columbite \Co*lum"bite\, n. [Cf. F. colombite. See Columbium .] (Min.) 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 ...
WordNet
Word definitions in WordNet
n. a black mineral that is an ore of niobium and tantalum [syn: niobite ]
Usage examples of columbite.
He must have got hold of about £10,000 from somewhere because the Express says that in 1946 he’d bought three tons of Columbite, which cost him around £3000 a ton.
Also made of Columbite alloy or they’d break away with the colossal air pressure.
He must have got hold of about £10,000 from somewhere because the Express says that in 1946 he'd bought three tons of Columbite, which cost him around £3000 a ton.
Also made of Columbite alloy or they'd break away with the colossal air pressure.
Drax's voice of controlled anger broke in on Bond's thoughts as he stood fingering the sharp leading edge of the tail of one of the Columbite fins.