data_[K18Rb6Na18]
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 [11.4952]
_cell_length_b [11.4952]
_cell_length_c [21.4572]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [148]
_chemical_formula_structural [K3RbNa3]
_chemical_formula_sum '[K18 Rb6 Na18]'
_cell_volume [2455.4683]
_cell_formula_units_Z [6]
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  18  0.0267  0.2424  0.9174  1
  Rb  Rb1  6  0.0000  0.0000  0.2670  1
  Na  Na2  18  0.0432  0.2205  0.4299  1
]