The compound described by SiO2 crystallizes in the hexagonal P6_3/mmc space group. Si(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(3) is bonded in a linear geometry to two equivalent Si(1) atoms. In the second O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Si(1) atoms. In the third O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Si(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.018
_cell_length_b   10.018
_cell_length_c   10.214
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   887.730
_cell_formula_units_Z   12
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  0.569  0.137  0.603  1.0
  Si  Si1  1  0.431  0.569  0.103  1.0
  Si  Si2  1  0.569  0.431  0.603  1.0
  Si  Si3  1  0.863  0.431  0.603  1.0
  Si  Si4  1  0.431  0.569  0.397  1.0
  Si  Si5  1  0.137  0.569  0.397  1.0
  Si  Si6  1  0.863  0.431  0.897  1.0
  Si  Si7  1  0.431  0.863  0.397  1.0
  Si  Si8  1  0.431  0.863  0.103  1.0
  Si  Si9  1  0.569  0.137  0.897  1.0
  Si  Si10  1  0.569  0.431  0.897  1.0
  Si  Si11  1  0.137  0.569  0.103  1.0
  O  O12  1  0.246  0.492  0.084  1.0
  O  O13  1  0.533  0.467  0.750  1.0
  O  O14  1  0.754  0.508  0.916  1.0
  O  O15  1  0.508  0.754  0.084  1.0
  O  O16  1  0.754  0.246  0.584  1.0
  O  O17  1  0.500  0.500  0.500  1.0
  O  O18  1  0.533  0.066  0.750  1.0
  O  O19  1  0.246  0.492  0.416  1.0
  O  O20  1  0.246  0.754  0.084  1.0
  O  O21  1  0.492  0.246  0.584  1.0
  O  O22  1  0.467  0.934  0.250  1.0
  O  O23  1  0.508  0.754  0.416  1.0
  O  O24  1  0.066  0.533  0.250  1.0
  O  O25  1  0.000  0.500  0.000  1.0
  O  O26  1  0.934  0.467  0.750  1.0
  O  O27  1  0.500  0.000  0.000  1.0
  O  O28  1  0.492  0.246  0.916  1.0
  O  O29  1  0.754  0.246  0.916  1.0
  O  O30  1  0.467  0.533  0.250  1.0
  O  O31  1  0.246  0.754  0.416  1.0
  O  O32  1  0.754  0.508  0.584  1.0
  O  O33  1  0.500  0.000  0.500  1.0
  O  O34  1  0.500  0.500  0.000  1.0
  O  O35  1  0.000  0.500  0.500  1.0
[/CIF]
.
The compound described by SiO2 crystallizes in the hexagonal P6_3/mmc space group. Si(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(3) is bonded in a linear geometry to two equivalent Si(1) atoms. In the second O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Si(1) atoms. In the third O site, O(2) is bonded in a distorted bent 150 degrees geometry to two equivalent Si(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.018
_cell_length_b   10.018
_cell_length_c   10.214
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   120.000
_symmetry_Int_Tables_number   1
_cell_volume   887.730
_cell_formula_units_Z   12
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  0.569  0.137  0.603  1.0
  Si  Si1  1  0.431  0.569  0.103  1.0
  Si  Si2  1  0.569  0.431  0.603  1.0
  Si  Si3  1  0.863  0.431  0.603  1.0
  Si  Si4  1  0.431  0.569  0.397  1.0
  Si  Si5  1  0.137  0.569  0.397  1.0
  Si  Si6  1  0.863  0.431  0.897  1.0
  Si  Si7  1  0.431  0.863  0.397  1.0
  Si  Si8  1  0.431  0.863  0.103  1.0
  Si  Si9  1  0.569  0.137  0.897  1.0
  Si  Si10  1  0.569  0.431  0.897  1.0
  Si  Si11  1  0.137  0.569  0.103  1.0
  O  O12  1  0.246  0.492  0.084  1.0
  O  O13  1  0.533  0.467  0.750  1.0
  O  O14  1  0.754  0.508  0.916  1.0
  O  O15  1  0.508  0.754  0.084  1.0
  O  O16  1  0.754  0.246  0.584  1.0
  O  O17  1  0.500  0.500  0.500  1.0
  O  O18  1  0.533  0.066  0.750  1.0
  O  O19  1  0.246  0.492  0.416  1.0
  O  O20  1  0.246  0.754  0.084  1.0
  O  O21  1  0.492  0.246  0.584  1.0
  O  O22  1  0.467  0.934  0.250  1.0
  O  O23  1  0.508  0.754  0.416  1.0
  O  O24  1  0.066  0.533  0.250  1.0
  O  O25  1  0.000  0.500  0.000  1.0
  O  O26  1  0.934  0.467  0.750  1.0
  O  O27  1  0.500  0.000  0.000  1.0
  O  O28  1  0.492  0.246  0.916  1.0
  O  O29  1  0.754  0.246  0.916  1.0
  O  O30  1  0.467  0.533  0.250  1.0
  O  O31  1  0.246  0.754  0.416  1.0
  O  O32  1  0.754  0.508  0.584  1.0
  O  O33  1  0.500  0.000  0.500  1.0
  O  O34  1  0.500  0.500  0.000  1.0
  O  O35  1  0.000  0.500  0.500  1.0
[/CIF]
.