data_SiBi2Pb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.28
_cell_length_b   9.28
_cell_length_c   9.28
_cell_angle_alpha   24.04
_cell_angle_beta   24.04
_cell_angle_gamma   24.04
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiBi2Pb
_chemical_formula_sum   'Si1 Bi2 Pb1'
_cell_volume   116.34
_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  Si3  1  0.0  0.0  0.0  1.0
  Bi  Bi0  1  0.0  0.0  0.8  1.0
  Bi  Bi1  1  0.0  0.0  0.21  1.0
  Pb  Pb2  1  0.0  0.0  0.5  1.0

data_SiBi2Pb
_symmetry_space_group_name_H-M   C2/m
_cell_length_a   6.69
_cell_length_b   3.86
_cell_length_c   9.28
_cell_angle_alpha   90.0
_cell_angle_beta   103.91
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   12
_chemical_formula_structural   SiBi2Pb
_chemical_formula_sum   'Si2 Bi4 Pb2'
_cell_volume   232.68
_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, -z'
  4  'x, -y, z'
  5  'x+1/2, y+1/2, z'
  6  '-x+1/2, -y+1/2, -z'
  7  '-x+1/2, y+1/2, -z'
  8  '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
  Si  Si0  2  0.0  0.0  0.0  1.0
  Bi  Bi1  4  0.0  0.0  0.2  1.0
  Pb  Pb2  2  0.0  0.0  0.5  1.0

Si Bi Bi Pb