Citation: Wenger, M.; Armbruster, T.; Geiger, C. A. (1991). Cation distribution in partially ordered columbite from the Kings Mountain pegmatite, North Carolina SAMPLE ncp1, T = 293 K. American Mineralogist, 76, pp. 1897-1904.
Formula: Fe0.333 Nb0.5 O2 Ta0.167
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Fe12 Nb12 O24 Ta12 (Fe Nb O2 Ta)
Multiplicity: 1