[CIF]
data_Si2Se
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   19.21374573
_cell_length_b   19.21374573
_cell_length_c   19.21374573
_cell_angle_alpha   169.83743554
_cell_angle_beta   169.83743554
_cell_angle_gamma   14.39100290
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2Se
_chemical_formula_sum   'Si8 Se4'
_cell_volume   220.81307687
_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
  Se  Se0  1  0.00000000  1.70174030  6.88941066  1
  Se  Se1  1  -0.00000000  1.70174030  12.17301796  1
  Se  Se2  1  0.00000000  -0.00000000  35.48305359  1
  Se  Se3  1  0.00000000  -0.00000000  2.64180365  1
  Si  Si4  1  -0.00000000  1.70174030  0.34810072  1
  Si  Si5  1  0.00000000  1.70174030  18.71432790  1
  Si  Si6  1  0.00000000  0.00000000  28.94174365  1
  Si  Si7  1  0.00000000  0.00000000  9.18311359  1
  Si  Si8  1  1.70174030  -0.00000000  13.33876668  1
  Si  Si9  1  1.70174030  -0.00000000  5.72366194  1
  Si  Si10  1  0.00000000  -0.00000000  22.86998099  1
  Si  Si11  1  0.00000000  -0.00000000  15.25487625  1
[/CIF]
