data_[K20Rb8Na12]
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 [C2/c]
_cell_length_a [15.2503]
_cell_length_b [20.6449]
_cell_length_c [8.1642]
_cell_angle_alpha [90.0000]
_cell_angle_beta [92.5636]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [K5Rb2Na3]
_chemical_formula_sum '[K20 Rb8 Na12]'
_cell_volume [2567.8496]
_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  0.1198  0.2612  0.1018  1
  K  K1  8  0.1319  0.1516  0.5762  1
  K  K2  8  0.2356  0.0460  0.0316  1
  K  K3  4  0.0000  0.4640  0.2500  1
  Na  Na4  8  0.1124  0.3549  0.6267  1
  Na  Na5  4  0.0000  0.0186  0.2500  1
]