data_SiSe5
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.48
_cell_length_b   6.93
_cell_length_c   6.93
_cell_angle_alpha   30.35
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiSe5
_chemical_formula_sum   'Si1 Se5'
_cell_volume   133.0
_cell_formula_units_Z   1
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  Si5  1  0.0  0.0  0.77  1.0
  Se  Se0  1  0.74  0.0  0.38  1.0
  Se  Se1  1  0.0  0.0  0.29  1.0
  Se  Se2  1  0.74  0.0  0.03  1.0
  Se  Se3  1  0.0  0.0  0.85  1.0
  Se  Se4  1  0.74  0.0  0.72  1.0

data_SiSe5
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.63
_cell_length_b   5.48
_cell_length_c   6.93
_cell_angle_alpha   90.0
_cell_angle_beta   105.17
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiSe5
_chemical_formula_sum   'Si1 Se5'
_cell_volume   133.0
_cell_formula_units_Z   1
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  1  0.23  0.0  0.23  1.0
  Se  Se1  1  0.15  0.0  0.15  1.0
  Se  Se2  1  0.28  0.74  0.28  1.0
  Se  Se3  1  0.62  0.74  0.62  1.0
  Se  Se4  1  0.71  0.0  0.71  1.0
  Se  Se5  1  0.97  0.74  0.97  1.0

Si Se Se Se Se Se