The structure described by SiO2 is quartz (beta)-like structured and crystallizes in the tetragonal I4/mcm space group. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the third O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the fourth O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.991
_cell_length_b   10.896
_cell_length_c   10.896
_cell_angle_alpha   80.197
_cell_angle_beta   65.631
_cell_angle_gamma   65.631
_symmetry_Int_Tables_number   1
_cell_volume   885.680
_cell_formula_units_Z   16
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  0.415  0.659  0.861  1.0
  Si  Si1  1  0.276  0.139  0.659  1.0
  Si  Si2  1  0.085  0.139  0.341  1.0
  Si  Si3  1  0.426  0.659  0.139  1.0
  Si  Si4  1  0.224  0.341  0.861  1.0
  Si  Si5  1  0.565  0.861  0.659  1.0
  Si  Si6  1  0.915  0.861  0.659  1.0
  Si  Si7  1  0.574  0.341  0.861  1.0
  Si  Si8  1  0.585  0.341  0.139  1.0
  Si  Si9  1  0.926  0.139  0.659  1.0
  Si  Si10  1  0.435  0.139  0.341  1.0
  Si  Si11  1  0.935  0.341  0.139  1.0
  Si  Si12  1  0.065  0.659  0.861  1.0
  Si  Si13  1  0.724  0.861  0.341  1.0
  Si  Si14  1  0.074  0.861  0.341  1.0
  Si  Si15  1  0.776  0.659  0.139  1.0
  O  O16  1  0.872  0.500  0.160  1.0
  O  O17  1  0.396  0.000  0.708  1.0
  O  O18  1  0.513  0.737  0.737  1.0
  O  O19  1  0.721  0.865  0.692  1.0
  O  O20  1  0.968  0.160  0.500  1.0
  O  O21  1  0.128  0.500  0.840  1.0
  O  O22  1  0.396  0.708  0.000  1.0
  O  O23  1  0.987  0.263  0.263  1.0
  O  O24  1  0.413  0.308  0.865  1.0
  O  O25  1  0.604  0.292  0.000  1.0
  O  O26  1  0.279  0.135  0.308  1.0
  O  O27  1  0.013  0.737  0.737  1.0
  O  O28  1  0.372  0.160  0.500  1.0
  O  O29  1  0.104  0.000  0.292  1.0
  O  O30  1  0.896  0.708  0.000  1.0
  O  O31  1  0.750  0.263  0.737  1.0
  O  O32  1  0.532  0.500  0.840  1.0
  O  O33  1  0.487  0.263  0.263  1.0
  O  O34  1  0.221  0.692  0.865  1.0
  O  O35  1  0.913  0.865  0.308  1.0
  O  O36  1  0.628  0.840  0.500  1.0
  O  O37  1  0.087  0.135  0.692  1.0
  O  O38  1  0.032  0.840  0.500  1.0
  O  O39  1  0.779  0.308  0.135  1.0
  O  O40  1  0.587  0.692  0.135  1.0
  O  O41  1  0.250  0.737  0.263  1.0
  O  O42  1  0.750  0.737  0.263  1.0
  O  O43  1  0.896  0.000  0.708  1.0
  O  O44  1  0.250  0.263  0.737  1.0
  O  O45  1  0.604  0.000  0.292  1.0
  O  O46  1  0.468  0.500  0.160  1.0
  O  O47  1  0.104  0.292  0.000  1.0
[/CIF]
.
The structure described by SiO2 is quartz (beta)-like structured and crystallizes in the tetragonal I4/mcm space group. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the third O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the fourth O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.991
_cell_length_b   10.896
_cell_length_c   10.896
_cell_angle_alpha   80.197
_cell_angle_beta   65.631
_cell_angle_gamma   65.631
_symmetry_Int_Tables_number   1
_cell_volume   885.680
_cell_formula_units_Z   16
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  0.415  0.659  0.861  1.0
  Si  Si1  1  0.276  0.139  0.659  1.0
  Si  Si2  1  0.085  0.139  0.341  1.0
  Si  Si3  1  0.426  0.659  0.139  1.0
  Si  Si4  1  0.224  0.341  0.861  1.0
  Si  Si5  1  0.565  0.861  0.659  1.0
  Si  Si6  1  0.915  0.861  0.659  1.0
  Si  Si7  1  0.574  0.341  0.861  1.0
  Si  Si8  1  0.585  0.341  0.139  1.0
  Si  Si9  1  0.926  0.139  0.659  1.0
  Si  Si10  1  0.435  0.139  0.341  1.0
  Si  Si11  1  0.935  0.341  0.139  1.0
  Si  Si12  1  0.065  0.659  0.861  1.0
  Si  Si13  1  0.724  0.861  0.341  1.0
  Si  Si14  1  0.074  0.861  0.341  1.0
  Si  Si15  1  0.776  0.659  0.139  1.0
  O  O16  1  0.872  0.500  0.160  1.0
  O  O17  1  0.396  0.000  0.708  1.0
  O  O18  1  0.513  0.737  0.737  1.0
  O  O19  1  0.721  0.865  0.692  1.0
  O  O20  1  0.968  0.160  0.500  1.0
  O  O21  1  0.128  0.500  0.840  1.0
  O  O22  1  0.396  0.708  0.000  1.0
  O  O23  1  0.987  0.263  0.263  1.0
  O  O24  1  0.413  0.308  0.865  1.0
  O  O25  1  0.604  0.292  0.000  1.0
  O  O26  1  0.279  0.135  0.308  1.0
  O  O27  1  0.013  0.737  0.737  1.0
  O  O28  1  0.372  0.160  0.500  1.0
  O  O29  1  0.104  0.000  0.292  1.0
  O  O30  1  0.896  0.708  0.000  1.0
  O  O31  1  0.750  0.263  0.737  1.0
  O  O32  1  0.532  0.500  0.840  1.0
  O  O33  1  0.487  0.263  0.263  1.0
  O  O34  1  0.221  0.692  0.865  1.0
  O  O35  1  0.913  0.865  0.308  1.0
  O  O36  1  0.628  0.840  0.500  1.0
  O  O37  1  0.087  0.135  0.692  1.0
  O  O38  1  0.032  0.840  0.500  1.0
  O  O39  1  0.779  0.308  0.135  1.0
  O  O40  1  0.587  0.692  0.135  1.0
  O  O41  1  0.250  0.737  0.263  1.0
  O  O42  1  0.750  0.737  0.263  1.0
  O  O43  1  0.896  0.000  0.708  1.0
  O  O44  1  0.250  0.263  0.737  1.0
  O  O45  1  0.604  0.000  0.292  1.0
  O  O46  1  0.468  0.500  0.160  1.0
  O  O47  1  0.104  0.292  0.000  1.0
[/CIF]
.