tantalite

noun
tan·ta·lite | \ ˈtan-tə-ˌlīt \

Definition of tantalite 

: a mineral consisting of a heavy dark lustrous oxide of tantalum and usually other metals (such as iron or manganese)

First Known Use of tantalite

1805, in the meaning defined above

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The first known use of tantalite was in 1805

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occurring twice a year or every two years

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