data_[Na2As2P4O16]
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
  P  2.1900  1.0000  0.5500
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [7.8549]
_cell_length_b [5.0826]
_cell_length_c [7.5016]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.2354]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [NaAs(PO4)2]
_chemical_formula_sum '[Na2 As2 P4 O16]'
_cell_volume [299.4896]
_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  2  0.0000  0.0000  0.5000  1.0
  As  As1  2  0.0000  0.0000  0.0000  1.0
  P  P2  4  0.1470  0.5000  0.7947  1.0
  O  O3  8  0.0275  0.2502  0.8207  1.0
  O  O4  4  0.2186  0.5000  0.6125  1.0
  O  O5  4  0.2296  0.0000  0.0406  1.0
]