data_[Ag4Sn2Bi2Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ag  1.9300  1.6000  1.0867
  Sn  1.9600  1.4500  0.8300
  Bi  2.0200  1.6000  1.0350
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Pmn2_1]
_cell_length_a [9.2742]
_cell_length_b [7.2480]
_cell_length_c [7.4669]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [31]
_chemical_formula_structural [Ag2SnBiSe4]
_chemical_formula_sum '[Ag4 Sn2 Bi2 Se8]'
_cell_volume [501.9181]
_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
[
  Ag  Ag0  4  0.2470  0.6796  0.4983  1.0
  Sn  Sn1  2  0.0000  0.8232  0.9991  1.0
  Bi  Bi2  2  0.0000  0.1806  0.4957  1.0
  Se  Se3  4  0.2415  0.6652  0.1392  1.0
  Se  Se4  2  0.0000  0.1747  0.0982  1.0
  Se  Se5  2  0.0000  0.8203  0.6322  1.0
]