data_[K4Rb12Na8]
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/m]
_cell_length_a [21.3825]
_cell_length_b [7.0359]
_cell_length_c [12.7659]
_cell_angle_alpha [90.0000]
_cell_angle_beta [120.9324]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [KRb3Na2]
_chemical_formula_sum '[K4 Rb12 Na8]'
_cell_volume [1647.4038]
_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  4  0.0250  0.0000  0.3362  1.0
  K  K1  4  0.1200  0.0000  0.0764  1.0
  Rb  Rb2  4  0.1325  0.5000  0.6778  1.0
  Rb  Rb3  4  0.1975  0.5000  0.3469  1.0
  Na  Na4  4  0.0389  0.5000  0.9069  1.0
  Na  Na5  4  0.2498  0.5000  0.0683  1.0
]