data_[Rb2Nb2Pb2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Nb  1.6000  1.4500  0.8200
  Pb  2.3300  1.8000  1.1225
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [6.8682]
_cell_length_b [6.4473]
_cell_length_c [8.1154]
_cell_angle_alpha [90.0000]
_cell_angle_beta [113.4156]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [RbNbPbO4]
_chemical_formula_sum '[Rb2 Nb2 Pb2 O8]'
_cell_volume [329.7688]
_cell_formula_units_Z [2]
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
[
  Rb  Rb0  2  0.2949  0.7500  0.0294  1.0
  Nb  Nb1  2  0.2853  0.2500  0.2999  1.0
  Pb  Pb2  2  0.1791  0.7500  0.4538  1.0
  O  O3  4  0.1073  0.0110  0.2512  1.0
  O  O4  2  0.4389  0.2500  0.1602  1.0
  O  O5  2  0.4850  0.2500  0.5416  1.0
]