data_[Na12Zn2Si4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Zn  1.6500  1.3500  0.8800
  Si  1.9000  1.1000  0.5400
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [9.7809]
_cell_length_b [5.1963]
_cell_length_c [9.0050]
_cell_angle_alpha [90.0000]
_cell_angle_beta [100.9536]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na6ZnSi2]
_chemical_formula_sum '[Na12 Zn2 Si4]'
_cell_volume [449.3396]
_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  0.0302  0.5000  0.7275  1.0
  Na  Na1  4  0.1785  0.0000  0.5801  1.0
  Na  Na2  4  0.2081  0.5000  0.0766  1.0
  Zn  Zn3  2  0.0000  0.0000  0.0000  1.0
  Si  Si4  4  0.1459  0.0000  0.2426  1.0
]