Citation: Cooper, M. A.; Hawthorne, F. C.; Cerny, P. (1999). Ta-Nb order in the crystal structure of niobium-rich calciotantite. The Canadian Mineralogist, 37, pp. 1289-1294.
Formula: Ca Nb1.179 O11 Ta2.821
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Nb8 O22 Ta8 (Nb4 O11 Ta4)
Multiplicity: 1