What's the difference between columbite and niobite?

Columbite

Definition:

• (n.) 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 in New England.

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Niobite

Definition:

• (n.) Same as Columbite.

Example Sentences: