data_[K8Rb20Na4]
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
  Na  0.9300  1.8000  1.1600
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [7.3639]
_cell_length_b [14.9633]
_cell_length_c [23.2887]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [K2Rb5Na]
_chemical_formula_sum '[K8 Rb20 Na4]'
_cell_volume [2566.1386]
_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  0.0523  0.1026  1.0
  K  K1  8  0.0000  0.2440  0.6579  1.0
  Rb  Rb2  8  0.0000  0.3500  0.0396  1.0
  Rb  Rb3  4  0.0000  0.4754  0.2500  1.0
  Na  Na4  4  0.0000  0.2021  0.2500  1.0
]