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
Word origin
C19: from tantalum + -ite1
tantalite in American English
(ˈtæntəˌlaɪt)
noun
a black, orthorhombic mineral, (Fe,Mn)(Ta,Nb)2O6, that is an ore of tantalum and niobium