data_SiW
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.92
_cell_length_b   4.92
_cell_length_c   4.92
_cell_angle_alpha   140.4
_cell_angle_beta   129.43
_cell_angle_gamma   66.06
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiW
_chemical_formula_sum   'Si2 W2'
_cell_volume   57.76
_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  Si0  1  0.67  0.05  0.11  1.0
  Si  Si1  1  0.0  0.05  0.01  1.0
  W  W2  1  0.67  0.05  0.02  1.0
  W  W3  1  0.0  0.05  0.1  1.0

data_SiW
_symmetry_space_group_name_H-M   P-1
_cell_length_a   3.33
_cell_length_b   4.2
_cell_length_c   4.92
_cell_angle_alpha   115.28
_cell_angle_beta   109.8
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   SiW
_chemical_formula_sum   'Si2 W2'
_cell_volume   57.76
_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  0.28  0.45  0.28  1.0
  W  W1  2  0.38  0.54  0.38  1.0

Si Si W W