data_[Na4Si4Ag4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Si  1.9000  1.1000  0.5400
  Ag  1.9300  1.6000  1.0867
]
_symmetry_space_group_name_H-M [Imm2]
_cell_length_a [4.5131]
_cell_length_b [7.1185]
_cell_length_c [7.5266]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [44]
_chemical_formula_structural [NaSiAg]
_chemical_formula_sum '[Na4 Si4 Ag4]'
_cell_volume [241.8034]
_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  2  0.0000  0.0000  0.7152  1.0
  Na  Na1  2  0.0000  0.5000  0.5933  1.0
  Si  Si2  4  0.0000  0.1666  0.3248  1.0
  Ag  Ag3  4  0.0000  0.2946  0.0003  1.0
]