data_[K12Rb16Na8]
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 [22.1972]
_cell_length_b [15.1055]
_cell_length_c [8.4058]
_cell_angle_alpha [90.0000]
_cell_angle_beta [111.5685]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [K3(Rb2Na)2]
_chemical_formula_sum '[K12 Rb16 Na8]'
_cell_volume [2621.1230]
_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  0.0766  0.2415  0.0260  1.0
  K  K1  8  0.0983  0.0561  0.4800  1.0
  Rb  Rb2  8  0.1880  0.3765  0.5807  1.0
  K  K3  4  0.0000  0.4944  0.2500  1.0
  Na  Na4  8  0.2445  0.1403  0.8943  1.0
]