data_[Na4Ag2O4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ag  1.9300  1.6000  1.0867
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [7.7978]
_cell_length_b [3.2576]
_cell_length_c [5.6637]
_cell_angle_alpha [90.0000]
_cell_angle_beta [102.7393]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2AgO2]
_chemical_formula_sum '[Na4 Ag2 O4]'
_cell_volume [140.3296]
_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  0.1678  0.0000  0.6656  1
  Ag  Ag1  2  0.0000  0.5000  0.0000  1
  O  O2  4  0.1109  0.0000  0.2442  1
]