data_[K4Rb12O4]
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 [Cmc2_1]
_cell_length_a [8.2996]
_cell_length_b [15.7271]
_cell_length_c [7.9561]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [36]
_chemical_formula_structural [KRb3O]
_chemical_formula_sum '[K4 Rb12 O4]'
_cell_volume [1038.4928]
_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  0.2497  0.2888  0.8082  1.0
  Rb  Rb1  4  0.0000  0.0870  0.9663  1.0
  K  K2  4  0.0000  0.4082  0.1437  1.0
  O  O3  4  0.0000  0.2511  0.0589  1.0
]