data_[K4Rb8O4]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Ama2]
_cell_length_a [7.1660]
_cell_length_b [7.7694]
_cell_length_c [13.3982]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [40]
_chemical_formula_structural [KRb2O]
_chemical_formula_sum '[K4 Rb8 O4]'
_cell_volume [745.9537]
_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
[
  K  K0  4  0.2500  0.1209  0.8740  1
  Rb  Rb1  4  0.2500  0.1319  0.1319  1
  Rb  Rb2  4  0.2500  0.2349  0.4977  1
  O  O3  4  0.0000  0.0000  0.9964  1
]