data_[Na16As4O2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  As  2.1800  1.1500  0.6600
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [17.5913]
_cell_length_b [4.8998]
_cell_length_c [6.0756]
_cell_angle_alpha [90.0000]
_cell_angle_beta [110.1945]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na8As2O]
_chemical_formula_sum '[Na16 As4 O2]'
_cell_volume [491.4854]
_cell_formula_units_Z [2]
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  4  0.0039  0.0000  0.2385  1.0
  Na  Na1  4  0.0969  0.5000  0.8234  1.0
  Na  Na2  4  0.1191  0.5000  0.3343  1.0
  Na  Na3  4  0.2282  0.0000  0.2032  1.0
  As  As4  4  0.1573  0.0000  0.6519  1.0
  O  O5  2  0.0000  0.5000  0.0000  1.0
]