data_[Na6O3]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P-62m]
_cell_length_a [6.1886]
_cell_length_b [6.1886]
_cell_length_c [3.6564]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [189]
_chemical_formula_structural [Na2O]
_chemical_formula_sum '[Na6 O3]'
_cell_volume [121.2754]
_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
[
  Na  Na0  3  0.0000  0.2613  0.5000  1.0
  Na  Na1  3  0.0000  0.5877  0.0000  1.0
  O  O2  2  0.3333  0.6667  0.5000  1.0
  O  O3  1  0.0000  0.0000  0.0000  1.0
]