data_Si2BiPb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.52
_cell_length_b   5.52
_cell_length_c   5.66
_cell_angle_alpha   111.77
_cell_angle_beta   111.77
_cell_angle_gamma   38.36
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2BiPb
_chemical_formula_sum   'Si2 Bi1 Pb1'
_cell_volume   98.24
_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  0.83  0.0  0.94  1.0
  Si  Si3  1  0.34  0.0  0.04  1.0
  Bi  Bi0  1  0.25  0.0  0.98  1.0
  Pb  Pb1  1  0.07  0.0  0.04  1.0

data_Si2BiPb
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.62
_cell_length_b   5.52
_cell_length_c   5.66
_cell_angle_alpha   111.77
_cell_angle_beta   90.0
_cell_angle_gamma   109.18
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2BiPb
_chemical_formula_sum   'Si2 Bi1 Pb1'
_cell_volume   98.24
_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  0.17  0.06  1.0
  Si  Si1  1  0.0  0.66  0.96  1.0
  Bi  Bi2  1  0.0  0.75  0.02  1.0
  Pb  Pb3  1  0.0  0.93  0.96  1.0

Si Si Bi Pb