a black, crystalline mineral, iron tantalate, (Fe, Mn) Ta 2 O 6 , the principal ore of tantalum and an end member of a series of solid solutions in which manganese and niobium combine to form columbite.

1795–1805; tantal(um) + -ite1

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World English Dictionary
tantalite (ˈtæntəˌlaɪt)
a heavy brownish mineral consisting of a tantalum oxide of iron and manganese in orthorhombic crystalline form: it occurs in coarse granite, often with columbite, and is an ore of tantalum. Formula: (Fe,Mn)(Ta,Nb)2O6
[C19: from tantalum + -ite1]

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Example sentences
Tantalum occurs principally in the mineral columbite-tantalite.
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