data_SiAs
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.15
_cell_length_b   7.15
_cell_length_c   7.15
_cell_angle_alpha   153.91
_cell_angle_beta   152.05
_cell_angle_gamma   38.6
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiAs
_chemical_formula_sum   'Si2 As2'
_cell_volume   75.31
_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  0.0  0.86  0.36  1.0
  Si  Si3  1  0.61  0.86  0.39  1.0
  As  As0  1  0.61  0.14  0.47  1.0
  As  As1  1  0.0  0.59  0.28  1.0

data_SiAs
_symmetry_space_group_name_H-M   P-1
_cell_length_a   3.23
_cell_length_b   3.46
_cell_length_c   7.15
_cell_angle_alpha   103.98
_cell_angle_beta   103.04
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   SiAs
_chemical_formula_sum   'Si2 As2'
_cell_volume   75.31
_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  0.21  0.02  0.21  1.0
  As  As1  2  0.28  0.82  0.01  1.0

Si Si As As
Si Si As As 0 3 o o o 1 2 o + o 