AM_Ca2Ta2O7_1
Formula: Ca7.676 Ta7.705 Nd.324 Zr.295 O28
Name: Ca2Ta2O7
Unit cell: 12.761 7.358 24.565 90.0 100.17 90.0 , V=2270.30
Space group: C121 (5)

Grey I E , Mumme W G , Ness T J , Roth R S , Smith K L , Journal of Solid State Chemistry , 174 (2003) p.285-295, Structural relations between weberite and zirconolite polytypes - refinements, of doped 3T and 4M Ca2Ta2O7 and 3T CaZrTi2O7, Sample: T = 295 K, 4M weberite-type structure