data_[Sr2Ag4Sn2Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Ag  1.9300  1.6000  1.0867
  Sn  1.9600  1.4500  0.8300
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [I222]
_cell_length_a [7.2179]
_cell_length_b [7.6290]
_cell_length_c [8.1322]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [23]
_chemical_formula_structural [SrAg2SnSe4]
_chemical_formula_sum '[Sr2 Ag4 Sn2 Se8]'
_cell_volume [447.8001]
_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
[
  Sr  Sr0  2  0.0000  0.0000  0.5000  1.0
  Ag  Ag1  4  0.0000  0.5000  0.3137  1.0
  Sn  Sn2  2  0.0000  0.0000  0.0000  1.0
  Se  Se3  8  0.2050  0.1934  0.8154  1.0
]