columbite

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Definitions from WordNet

Noun columbite has 1 sense

niobite, columbite - a black mineral that is an ore of niobium and tantalum
--₁ is a kind of mineral
--₁ has substances:
niobium, Nb, atomic number 41; tantalum, Ta, atomic number 73

Definitions from the Web

Columbite

Definition: Columbite is a black, brown, or sometimes colorless mineral consisting of a niobium and tantalum oxide. It is typically found in granite and granite pegmatite deposits.

Sample Sentences:

Columbite is commonly used as an ore for tantalum and niobium.
The deposits of columbite in this region are known for their high purity.
Miners often extract columbite from granite pegmatite veins.

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