data_Si2Cl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.67
_cell_length_b   7.67
_cell_length_c   6.72
_cell_angle_alpha   113.14
_cell_angle_beta   113.14
_cell_angle_gamma   29.45
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2Cl
_chemical_formula_sum   'Si4 Cl2'
_cell_volume   177.45
_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
  Si  Si2  1  0.9  0.0  0.64  1.0
  Si  Si3  1  0.2  0.0  0.5  1.0
  Si  Si4  1  0.5  0.0  0.53  1.0
  Si  Si5  1  0.6  0.0  0.61  1.0
  Cl  Cl0  1  0.18  0.0  0.97  1.0
  Cl  Cl1  1  0.92  0.0  0.17  1.0

data_Si2Cl
_symmetry_space_group_name_H-M   P-1
_cell_length_a   3.9
_cell_length_b   6.72
_cell_length_c   7.67
_cell_angle_alpha   113.14
_cell_angle_beta   104.72
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   Si2Cl
_chemical_formula_sum   'Si4 Cl2'
_cell_volume   177.45
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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  2  0.0  0.43  0.15  1.0
  Si  Si1  2  0.0  0.46  0.45  1.0
  Cl  Cl2  2  0.0  0.1  0.87  1.0

Si Si Si Si Cl Cl
Si Si Si Si Cl Cl 0 3 o o o 0 4 + o o 1 5 - o o 1 2 o o o 2 3 o o o 4 5 - o + 