data_[Na16Ag4]
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
]
_symmetry_space_group_name_H-M [I4_1/a]
_cell_length_a [6.5893]
_cell_length_b [6.5893]
_cell_length_c [14.9035]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [88]
_chemical_formula_structural [Na4Ag]
_chemical_formula_sum '[Na16 Ag4]'
_cell_volume [647.0886]
_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  16  0.1412  0.7370  0.4211  1
  Ag  Ag1  4  0.0000  0.0000  0.0000  1
]