data_[Rb12Na12Bi8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Na  0.9300  1.8000  1.1600
  Bi  2.0200  1.6000  1.0350
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [5.7000]
_cell_length_b [13.1764]
_cell_length_c [20.0890]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Rb3Na3Bi2]
_chemical_formula_sum '[Rb12 Na12 Bi8]'
_cell_volume [1508.7842]
_cell_formula_units_Z [4]
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  8  0.0000  0.0728  0.6023  1.0
  Rb  Rb1  4  0.0000  0.3705  0.7500  1.0
  Na  Na2  8  0.0000  0.3223  0.5371  1.0
  Na  Na3  4  0.0000  0.3055  0.2500  1.0
  Bi  Bi4  8  0.0000  0.2168  0.1102  1.0
]