data_[K20Rb8Na8]
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 [Ima2]
_cell_length_a [18.7314]
_cell_length_b [12.6390]
_cell_length_c [10.6245]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [46]
_chemical_formula_structural [K5(RbNa)2]
_chemical_formula_sum '[K20 Rb8 Na8]'
_cell_volume [2515.3227]
_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  8  0.0466  0.1727  0.3069  1.0
  Rb  Rb1  8  0.1268  0.4853  0.4457  1.0
  K  K2  8  0.1446  0.6960  0.0760  1.0
  K  K3  4  0.2500  0.1767  0.5944  1.0
  Na  Na4  4  0.0000  0.0000  0.6283  1.0
  Na  Na5  4  0.2500  0.5253  0.7840  1.0
]