data_Si2AsPb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.59
_cell_length_b   5.59
_cell_length_c   5.59
_cell_angle_alpha   143.67
_cell_angle_beta   122.62
_cell_angle_gamma   69.84
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2AsPb
_chemical_formula_sum   'Si2 As1 Pb1'
_cell_volume   85.89
_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  0.74  0.0  0.9  1.0
  Si  Si3  1  0.0  0.69  0.69  1.0
  As  As0  1  0.0  0.0  0.0  1.0
  Pb  Pb1  1  0.0  0.0  0.59  1.0

data_Si2AsPb
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.49
_cell_length_b   5.37
_cell_length_c   5.59
_cell_angle_alpha   118.69
_cell_angle_beta   108.17
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2AsPb
_chemical_formula_sum   'Si2 As1 Pb1'
_cell_volume   85.89
_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  0.31  1.0  1.0  1.0
  Si  Si1  1  0.85  0.1  0.85  1.0
  As  As2  1  0.0  0.0  0.0  1.0
  Pb  Pb3  1  0.41  0.41  0.41  1.0

Si Si As Pb