data_[Si4Ag8Te8Se4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Si  1.9000  1.1000  0.5400
  Ag  1.9300  1.6000  1.0867
  Te  2.1000  1.4000  1.2933
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Cmc2_1]
_cell_length_a [13.2246]
_cell_length_b [7.5631]
_cell_length_c [6.9903]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [36]
_chemical_formula_structural [SiAg2Te2Se]
_chemical_formula_sum '[Si4 Ag8 Te8 Se4]'
_cell_volume [699.1697]
_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
[
  Si  Si0  4  0.0000  0.1464  0.8046  1
  Ag  Ag1  8  0.1507  0.3359  0.3176  1
  Te  Te2  8  0.1577  0.3076  0.7132  1
  Se  Se3  4  0.0000  0.1393  0.1606  1
]