data_SiS
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.34
_cell_length_b   3.34
_cell_length_c   3.45
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiS
_chemical_formula_sum   'Si1 S1'
_cell_volume   33.32
_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  Si1  1  0.0  0.0  0.0  1.0
  S  S0  1  1.0  0.93  0.73  1.0

data_SiS
_symmetry_space_group_name_H-M   Cm
_cell_length_a   3.34
_cell_length_b   5.78
_cell_length_c   3.45
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   SiS
_chemical_formula_sum   'Si2 S2'
_cell_volume   66.64
_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  0.0  1.0
  S  S1  2  0.43  0.5  0.73  1.0

Si S
SiS is Hg_xSn structured and crystallizes in the monoclinic Cm space group. The structure is zero-dimensional and consists of two SiS clusters. Si(1) is bonded in a single-bond geometry to one S(1) atom. The Si(1)-S(1) bond length is 0.97 Å. S(1) is bonded in a single-bond geometry to one Si(1) atom.