data_[K8Rb4Bi4O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Rb  0.8200  2.3500  1.6600
  Bi  2.0200  1.6000  1.0350
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Imma]
_cell_length_a [7.0634]
_cell_length_b [7.3153]
_cell_length_c [11.8988]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [74]
_chemical_formula_structural [K2RbBiO4]
_chemical_formula_sum '[K8 Rb4 Bi4 O16]'
_cell_volume [614.8255]
_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  4  0.0000  0.0000  0.0000  1.0
  K  K1  4  0.0000  0.0000  0.5000  1.0
  K  K2  4  0.2500  0.2500  0.7500  1.0
  Bi  Bi3  4  0.2500  0.2500  0.2500  1.0
  O  O4  8  0.0000  0.0421  0.2493  1.0
  O  O5  8  0.2421  0.2500  0.4228  1.0
]