data_Si2SeCl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.68
_cell_length_b   3.68
_cell_length_c   8.64
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   124.08
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2SeCl
_chemical_formula_sum   'Si2 Se1 Cl1'
_cell_volume   97.08
_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  Si2  1  0.0  0.0  0.49  1.0
  Si  Si3  1  0.73  0.0  0.7  1.0
  Se  Se1  1  0.73  0.0  0.43  1.0
  Cl  Cl0  1  0.0  0.0  1.0  1.0

data_Si2SeCl
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.45
_cell_length_b   3.68
_cell_length_c   8.64
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   117.96
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2SeCl
_chemical_formula_sum   'Si2 Se1 Cl1'
_cell_volume   97.08
_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  0.0  0.0  0.49  1.0
  Si  Si1  1  0.0  0.73  0.7  1.0
  Se  Se2  1  0.0  0.73  0.43  1.0
  Cl  Cl3  1  0.0  0.0  1.0  1.0

Si Si Se Cl