data_SiH3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.73
_cell_length_b   5.73
_cell_length_c   2.53
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   SiH3
_chemical_formula_sum   'Si2 H6'
_cell_volume   72.16
_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  Si6  1  0.0  0.31  0.63  1.0
  Si  Si7  1  0.87  0.66  0.9  1.0
  H  H0  1  0.0  0.14  0.9  1.0
  H  H1  1  0.01  0.9  0.9  1.0
  H  H2  1  0.99  0.9  0.9  1.0
  H  H3  1  0.87  0.83  0.63  1.0
  H  H4  1  0.85  0.07  0.63  1.0
  H  H5  1  0.88  0.07  0.63  1.0

data_SiH3
_symmetry_space_group_name_H-M   P-1
_cell_length_a   2.53
_cell_length_b   5.73
_cell_length_c   5.73
_cell_angle_alpha   120.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   SiH3
_chemical_formula_sum   'Si2 H6'
_cell_volume   72.16
_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  0.37  0.57  0.83  1.0
  H  H1  2  0.37  0.42  0.59  1.0
  H  H2  2  0.37  0.43  0.34  1.0
  H  H3  2  0.37  0.45  0.59  1.0

Si Si H H H H H H
Si Si H H H H H H 0 6 - o o 0 2 o o o 0 7 - o o 1 5 o o o 1 4 o o o 1 3 + o o 2 7 - o o 2 6 - o o 3 4 - o o 3 5 - o o 4 5 o o o 6 7 o o o 