The material structure described by Si crystallizes in the hexagonal P6_3/mmc space group. Si(1) is bonded to eight equivalent Si(1) atoms to form a mixture of distorted corner, edge, and face-sharing SiSi8 hexagonal bipyramids. is represented by the CIF card [CIF]
data_Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.087
_cell_length_b   5.087
_cell_length_c   4.254
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   95.339
_cell_formula_units_Z   6
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  0.667  0.834  0.250  1.0
  Si  Si1  1  0.834  0.166  0.750  1.0
  Si  Si2  1  0.166  0.333  0.250  1.0
  Si  Si3  1  0.834  0.667  0.750  1.0
  Si  Si4  1  0.333  0.166  0.750  1.0
  Si  Si5  1  0.166  0.834  0.250  1.0
[/CIF]
.
The material structure described by Si crystallizes in the hexagonal P6_3/mmc space group. Si(1) is bonded to eight equivalent Si(1) atoms to form a mixture of distorted corner, edge, and face-sharing SiSi8 hexagonal bipyramids. is represented by the CIF card [CIF]
data_Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.087
_cell_length_b   5.087
_cell_length_c   4.254
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   95.339
_cell_formula_units_Z   6
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  0.667  0.834  0.250  1.0
  Si  Si1  1  0.834  0.166  0.750  1.0
  Si  Si2  1  0.166  0.333  0.250  1.0
  Si  Si3  1  0.834  0.667  0.750  1.0
  Si  Si4  1  0.333  0.166  0.750  1.0
  Si  Si5  1  0.166  0.834  0.250  1.0
[/CIF]
.