data_Si2Cl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.95
_cell_length_b   7.95
_cell_length_c   3.01
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   146.14
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2Cl
_chemical_formula_sum   'Si4 Cl2'
_cell_volume   106.13
_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  0.31  0.15  0.26  1.0
  Si  Si3  1  0.31  0.85  0.75  1.0
  Si  Si4  1  0.31  0.69  0.26  1.0
  Si  Si5  1  0.31  0.31  0.75  1.0
  Cl  Cl0  1  0.31  0.2  0.26  1.0
  Cl  Cl1  1  0.31  0.8  0.75  1.0

data_Si2Cl
_symmetry_space_group_name_H-M   P2_1/m
_cell_length_a   4.63
_cell_length_b   3.01
_cell_length_c   7.95
_cell_angle_alpha   90.0
_cell_angle_beta   106.93
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   11
_chemical_formula_structural   Si2Cl
_chemical_formula_sum   'Si4 Cl2'
_cell_volume   106.13
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-x, -y, -z'
  3  '-x, y+1/2, -z'
  4  'x, -y+1/2, 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  0.15  0.75  0.65  1.0
  Si  Si1  2  0.31  0.25  0.81  1.0
  Cl  Cl2  2  0.2  0.75  0.7  1.0

Si Si Si Si Cl Cl