Citation: Yamnova, N. A.; Pushcharovsky D Yu; Voloshin, A. V. (1988). Identity of ungursaite with calciotantite and synthetic CaTa4O11 Note: displacement parameters taken from ICSD. Soviet Physics Crystallography, 33, pp. 498-499.
Formula: Ca0.94 Na0.06 Nb0.13 O10.97 Ta3.86
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: Nb2 O22 Ta8 (Nb O11 Ta4)
Multiplicity: 1