data_Bi2AsCl
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.58
_cell_length_b   3.58
_cell_length_c   7.61
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Bi2AsCl
_chemical_formula_sum   'Bi2 As1 Cl1'
_cell_volume   97.72
_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
  Bi  Bi1  1  0.79  0.79  0.58  1.0
  Bi  Bi2  1  0.79  0.79  0.03  1.0
  As  As0  1  0.0  0.0  0.81  1.0
  Cl  Cl3  1  0.0  0.0  0.0  1.0

data_Bi2AsCl
_symmetry_space_group_name_H-M   Cm
_cell_length_a   5.07
_cell_length_b   5.07
_cell_length_c   7.61
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Bi2AsCl
_chemical_formula_sum   'Bi4 As2 Cl2'
_cell_volume   195.44
_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+1/2, y+1/2, z'
  4  'x+1/2, -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
  Bi  Bi0  2  0.29  0.5  0.03  1.0
  Bi  Bi1  2  0.29  0.5  0.58  1.0
  As  As2  2  0.0  0.0  0.81  1.0
  Cl  Cl3  2  0.0  0.0  0.0  1.0

Bi Bi As Cl
Bi Bi As Cl 0 2 + + o 1 3 + + o 2 3 o o + 