data_[Na4As4O8]
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/c]
_cell_length_a [7.1318]
_cell_length_b [7.3744]
_cell_length_c [5.3742]
_cell_angle_alpha [90.0000]
_cell_angle_beta [125.9557]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [NaAsO2]
_chemical_formula_sum '[Na4 As4 O8]'
_cell_volume [228.7904]
_cell_formula_units_Z [4]
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  0.0000  0.3672  0.2500  1.0
  As  As1  4  0.0000  0.0931  0.7500  1.0
  O  O2  8  0.1938  0.0618  0.2409  1.0
]