data_Si2Sb
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.97
_cell_length_b   4.97
_cell_length_c   5.47
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   117.18
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2Sb
_chemical_formula_sum   'Si4 Sb2'
_cell_volume   120.16
_cell_formula_units_Z   2
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  0.59  0.81  0.37  1.0
  Si  Si3  1  0.59  0.19  0.1  1.0
  Si  Si4  1  0.59  0.49  0.37  1.0
  Si  Si5  1  0.59  0.51  0.1  1.0
  Sb  Sb0  1  0.59  0.6  0.1  1.0
  Sb  Sb1  1  0.59  0.4  0.37  1.0

data_Si2Sb
_symmetry_space_group_name_H-M   P-1
_cell_length_a   4.97
_cell_length_b   4.97
_cell_length_c   5.47
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   117.18
_symmetry_Int_Tables_number   2
_chemical_formula_structural   Si2Sb
_chemical_formula_sum   'Si4 Sb2'
_cell_volume   120.16
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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  2  0.5  0.19  0.87  1.0
  Si  Si1  2  0.5  0.49  0.13  1.0
  Sb  Sb2  2  0.5  0.4  0.13  1.0

Si Si Si Si Sb Sb
Si Si Si Si Sb Sb 0 4 o o o 0 2 o o o 1 5 o o o 1 3 o o o 2 5 o o o 3 4 o o o 