data_SrSi
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.56
_cell_length_b   6.56
_cell_length_c   6.56
_cell_angle_alpha   145.46
_cell_angle_beta   136.37
_cell_angle_gamma   56.8
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SrSi
_chemical_formula_sum   'Sr2 Si2'
_cell_volume   109.43
_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
  Sr  Sr2  1  0.0  0.22  0.4  1.0
  Sr  Sr3  1  0.95  0.22  0.36  1.0
  Si  Si0  1  0.0  0.65  0.1  1.0
  Si  Si1  1  0.95  0.78  0.67  1.0

data_SrSi
_symmetry_space_group_name_H-M   P-1
_cell_length_a   3.89
_cell_length_b   4.87
_cell_length_c   6.56
_cell_angle_alpha   111.81
_cell_angle_beta   107.27
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   SrSi
_chemical_formula_sum   'Sr2 Si2'
_cell_volume   109.43
_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
  Sr  Sr0  2  0.49  0.52  0.49  1.0
  Si  Si1  2  0.19  0.78  0.75  1.0

Sr Sr Si Si
Sr Sr Si Si 0 1 - o o 0 2 o - o 0 2 o o + 0 3 - o o 0 3 - - - 1 2 + o + 1 2 + - o 1 3 o - - 1 3 o o o 