data_[Na6As2O8]
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 [Pmn2_1]
_cell_length_a [7.1112]
_cell_length_b [6.1310]
_cell_length_c [5.6398]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [31]
_chemical_formula_structural [Na3AsO4]
_chemical_formula_sum '[Na6 As2 O8]'
_cell_volume [245.8893]
_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  0.2447  0.3239  0.9941  1.0
  Na  Na1  2  0.0000  0.1498  0.4919  1.0
  As  As2  2  0.0000  0.8216  0.0025  1.0
  O  O3  4  0.2001  0.6893  0.9022  1.0
  O  O4  2  0.0000  0.0891  0.9054  1.0
  O  O5  2  0.0000  0.8152  0.3079  1.0
]