data_Si2Sb3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.79
_cell_length_b   8.79
_cell_length_c   8.79
_cell_angle_alpha   26.64
_cell_angle_beta   26.64
_cell_angle_gamma   26.64
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Si2Sb3
_chemical_formula_sum   'Si2 Sb3'
_cell_volume   120.23
_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  0.26  1.0
  Si  Si4  1  0.0  0.0  0.15  1.0
  Sb  Sb0  1  0.0  0.0  0.0  1.0
  Sb  Sb1  1  0.0  0.0  0.34  1.0
  Sb  Sb2  1  0.0  0.0  0.07  1.0

data_Si2Sb3
_symmetry_space_group_name_H-M   Cm
_cell_length_a   7.01
_cell_length_b   4.05
_cell_length_c   8.79
_cell_angle_alpha   90.0
_cell_angle_beta   105.43
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   Si2Sb3
_chemical_formula_sum   'Si4 Sb6'
_cell_volume   240.46
_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+1/2, y+1/2, z'
  4  '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  0.74  1.0
  Si  Si1  2  0.0  0.0  0.85  1.0
  Sb  Sb2  2  0.0  0.0  0.0  1.0
  Sb  Sb3  2  0.0  0.0  0.66  1.0
  Sb  Sb4  2  0.0  0.0  0.93  1.0

Si Si Sb Sb Sb