data_Si2BiAs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.76
_cell_length_b   3.88
_cell_length_c   6.33
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2BiAs
_chemical_formula_sum   'Si2 Bi1 As1'
_cell_volume   92.15
_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  0.0  0.0  0.28  1.0
  Si  Si3  1  0.88  0.94  0.9  1.0
  Bi  Bi1  1  0.88  0.94  0.3  1.0
  As  As0  1  0.0  0.0  0.34  1.0

data_Si2BiAs
_symmetry_space_group_name_H-M   P1
_cell_length_a   3.76
_cell_length_b   3.88
_cell_length_c   6.33
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2BiAs
_chemical_formula_sum   'Si2 Bi1 As1'
_cell_volume   92.15
_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  0.0  0.28  1.0
  Si  Si1  1  0.88  0.94  0.9  1.0
  Bi  Bi2  1  0.88  0.94  0.3  1.0
  As  As3  1  0.0  0.0  0.34  1.0

Si Si Bi As