data_[Na6O6]
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 [6.2808]
_cell_length_b [6.2808]
_cell_length_c [4.5083]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [189]
_chemical_formula_structural [Na2O2]
_chemical_formula_sum '[Na6 O6]'
_cell_volume [154.0200]
_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  0.3002  0.5000  1.0
  Na  Na1  3  0.0000  0.6345  0.0000  1.0
  O  O2  4  0.3333  0.6667  0.6726  1.0
  O  O3  2  0.0000  0.0000  0.1707  1.0
]