The compound described by SiO2 is low (alpha) Cristobalite-like structured and crystallizes in the tetragonal I4/mmm 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(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the third O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the fourth O site, O(4) 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   11.068
_cell_length_b   11.068
_cell_length_c   11.068
_cell_angle_alpha   101.627
_cell_angle_beta   101.627
_cell_angle_gamma   126.649
_symmetry_Int_Tables_number   1
_cell_volume   972.072
_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  0.266  0.422  0.378  1.0
  Si  Si1  1  0.888  0.266  0.843  1.0
  Si  Si2  1  0.422  0.045  0.157  1.0
  Si  Si3  1  0.955  0.578  0.843  1.0
  Si  Si4  1  0.734  0.112  0.157  1.0
  Si  Si5  1  0.045  0.888  0.622  1.0
  Si  Si6  1  0.112  0.955  0.378  1.0
  Si  Si7  1  0.578  0.734  0.622  1.0
  Si  Si8  1  0.734  0.578  0.622  1.0
  Si  Si9  1  0.112  0.734  0.157  1.0
  Si  Si10  1  0.578  0.955  0.843  1.0
  Si  Si11  1  0.045  0.422  0.157  1.0
  Si  Si12  1  0.266  0.888  0.843  1.0
  Si  Si13  1  0.955  0.112  0.378  1.0
  Si  Si14  1  0.888  0.045  0.622  1.0
  Si  Si15  1  0.422  0.266  0.378  1.0
  O  O16  1  0.356  0.356  0.343  1.0
  O  O17  1  0.013  0.356  0.000  1.0
  O  O18  1  0.356  0.013  0.000  1.0
  O  O19  1  0.987  0.644  0.000  1.0
  O  O20  1  0.644  0.987  0.000  1.0
  O  O21  1  0.013  0.013  0.657  1.0
  O  O22  1  0.987  0.987  0.343  1.0
  O  O23  1  0.644  0.644  0.657  1.0
  O  O24  1  0.123  0.299  0.422  1.0
  O  O25  1  0.701  0.123  0.824  1.0
  O  O26  1  0.299  0.877  0.176  1.0
  O  O27  1  0.123  0.701  0.824  1.0
  O  O28  1  0.877  0.299  0.176  1.0
  O  O29  1  0.877  0.701  0.578  1.0
  O  O30  1  0.299  0.123  0.422  1.0
  O  O31  1  0.701  0.877  0.578  1.0
  O  O32  1  0.188  0.432  0.245  1.0
  O  O33  1  0.943  0.188  0.755  1.0
  O  O34  1  0.432  0.188  0.245  1.0
  O  O35  1  0.812  0.568  0.755  1.0
  O  O36  1  0.812  0.057  0.245  1.0
  O  O37  1  0.188  0.943  0.755  1.0
  O  O38  1  0.057  0.812  0.245  1.0
  O  O39  1  0.568  0.812  0.755  1.0
  O  O40  1  0.397  0.603  0.500  1.0
  O  O41  1  0.897  0.397  0.794  1.0
  O  O42  1  0.603  0.103  0.206  1.0
  O  O43  1  0.103  0.897  0.500  1.0
  O  O44  1  0.603  0.397  0.500  1.0
  O  O45  1  0.103  0.603  0.206  1.0
  O  O46  1  0.397  0.897  0.794  1.0
  O  O47  1  0.897  0.103  0.500  1.0
[/CIF]
.
The compound described by SiO2 is low (alpha) Cristobalite-like structured and crystallizes in the tetragonal I4/mmm 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(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the third O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the fourth O site, O(4) 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   11.068
_cell_length_b   11.068
_cell_length_c   11.068
_cell_angle_alpha   101.627
_cell_angle_beta   101.627
_cell_angle_gamma   126.649
_symmetry_Int_Tables_number   1
_cell_volume   972.072
_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  0.266  0.422  0.378  1.0
  Si  Si1  1  0.888  0.266  0.843  1.0
  Si  Si2  1  0.422  0.045  0.157  1.0
  Si  Si3  1  0.955  0.578  0.843  1.0
  Si  Si4  1  0.734  0.112  0.157  1.0
  Si  Si5  1  0.045  0.888  0.622  1.0
  Si  Si6  1  0.112  0.955  0.378  1.0
  Si  Si7  1  0.578  0.734  0.622  1.0
  Si  Si8  1  0.734  0.578  0.622  1.0
  Si  Si9  1  0.112  0.734  0.157  1.0
  Si  Si10  1  0.578  0.955  0.843  1.0
  Si  Si11  1  0.045  0.422  0.157  1.0
  Si  Si12  1  0.266  0.888  0.843  1.0
  Si  Si13  1  0.955  0.112  0.378  1.0
  Si  Si14  1  0.888  0.045  0.622  1.0
  Si  Si15  1  0.422  0.266  0.378  1.0
  O  O16  1  0.356  0.356  0.343  1.0
  O  O17  1  0.013  0.356  0.000  1.0
  O  O18  1  0.356  0.013  0.000  1.0
  O  O19  1  0.987  0.644  0.000  1.0
  O  O20  1  0.644  0.987  0.000  1.0
  O  O21  1  0.013  0.013  0.657  1.0
  O  O22  1  0.987  0.987  0.343  1.0
  O  O23  1  0.644  0.644  0.657  1.0
  O  O24  1  0.123  0.299  0.422  1.0
  O  O25  1  0.701  0.123  0.824  1.0
  O  O26  1  0.299  0.877  0.176  1.0
  O  O27  1  0.123  0.701  0.824  1.0
  O  O28  1  0.877  0.299  0.176  1.0
  O  O29  1  0.877  0.701  0.578  1.0
  O  O30  1  0.299  0.123  0.422  1.0
  O  O31  1  0.701  0.877  0.578  1.0
  O  O32  1  0.188  0.432  0.245  1.0
  O  O33  1  0.943  0.188  0.755  1.0
  O  O34  1  0.432  0.188  0.245  1.0
  O  O35  1  0.812  0.568  0.755  1.0
  O  O36  1  0.812  0.057  0.245  1.0
  O  O37  1  0.188  0.943  0.755  1.0
  O  O38  1  0.057  0.812  0.245  1.0
  O  O39  1  0.568  0.812  0.755  1.0
  O  O40  1  0.397  0.603  0.500  1.0
  O  O41  1  0.897  0.397  0.794  1.0
  O  O42  1  0.603  0.103  0.206  1.0
  O  O43  1  0.103  0.897  0.500  1.0
  O  O44  1  0.603  0.397  0.500  1.0
  O  O45  1  0.103  0.603  0.206  1.0
  O  O46  1  0.397  0.897  0.794  1.0
  O  O47  1  0.897  0.103  0.500  1.0
[/CIF]
.