data_[K8Rb20Na8]
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 [26.2045]
_cell_length_b [8.3934]
_cell_length_c [12.1479]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [46]
_chemical_formula_structural [K2Rb5Na2]
_chemical_formula_sum '[K8 Rb20 Na8]'
_cell_volume [2671.8468]
_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  0.0675  0.6238  0.9419  1.0
  Rb  Rb1  8  0.0869  0.1125  0.7863  1.0
  Rb  Rb2  8  0.1656  0.5637  0.6369  1.0
  Rb  Rb3  4  0.2500  0.0776  0.4872  1.0
  Na  Na4  4  0.0000  0.0000  0.1193  1.0
  Na  Na5  4  0.2500  0.5664  0.3274  1.0
]