data_[K18Rb36Na3]
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 [R-3]
_cell_length_a [16.3384]
_cell_length_b [16.3384]
_cell_length_c [20.4355]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [148]
_chemical_formula_structural [K6Rb12Na]
_chemical_formula_sum '[K18 Rb36 Na3]'
_cell_volume [4724.2751]
_cell_formula_units_Z [3]
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  18  0.0385  0.1840  0.8130  1.0
  K  K1  18  0.0419  0.4479  0.7039  1.0
  Rb  Rb2  18  0.0641  0.8506  0.4111  1.0
  Na  Na3  3  0.0000  0.0000  0.0000  1.0
]