The compound described by SiO2 is Low Tridymite-like structured and crystallizes in the cubic P2_13 space group. Si(1,2) is bonded to one O(2) and three equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1,2) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent Si(1,2) atoms. is represented by the CIF card [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.082
_cell_length_b   7.082
_cell_length_c   7.082
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   355.158
_cell_formula_units_Z   8
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  0.978  0.522  0.478  1.0
  Si  Si1  1  0.522  0.478  0.978  1.0
  Si  Si2  1  0.478  0.978  0.522  1.0
  Si  Si3  1  0.022  0.022  0.022  1.0
  Si  Si4  1  0.717  0.783  0.217  1.0
  Si  Si5  1  0.783  0.217  0.717  1.0
  Si  Si6  1  0.217  0.717  0.783  1.0
  Si  Si7  1  0.283  0.283  0.283  1.0
  O  O8  1  0.861  0.336  0.539  1.0
  O  O9  1  0.361  0.164  0.461  1.0
  O  O10  1  0.139  0.836  0.961  1.0
  O  O11  1  0.164  0.461  0.361  1.0
  O  O12  1  0.961  0.139  0.836  1.0
  O  O13  1  0.461  0.361  0.164  1.0
  O  O14  1  0.336  0.539  0.861  1.0
  O  O15  1  0.539  0.861  0.336  1.0
  O  O16  1  0.152  0.152  0.152  1.0
  O  O17  1  0.348  0.848  0.652  1.0
  O  O18  1  0.652  0.348  0.848  1.0
  O  O19  1  0.848  0.652  0.348  1.0
  O  O20  1  0.639  0.664  0.039  1.0
  O  O21  1  0.039  0.639  0.664  1.0
  O  O22  1  0.664  0.039  0.639  1.0
  O  O23  1  0.836  0.961  0.139  1.0
[/CIF]
.
The compound described by SiO2 is Low Tridymite-like structured and crystallizes in the cubic P2_13 space group. Si(1,2) is bonded to one O(2) and three equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1,2) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent Si(1,2) atoms. is represented by the CIF card [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.082
_cell_length_b   7.082
_cell_length_c   7.082
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   355.158
_cell_formula_units_Z   8
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  0.978  0.522  0.478  1.0
  Si  Si1  1  0.522  0.478  0.978  1.0
  Si  Si2  1  0.478  0.978  0.522  1.0
  Si  Si3  1  0.022  0.022  0.022  1.0
  Si  Si4  1  0.717  0.783  0.217  1.0
  Si  Si5  1  0.783  0.217  0.717  1.0
  Si  Si6  1  0.217  0.717  0.783  1.0
  Si  Si7  1  0.283  0.283  0.283  1.0
  O  O8  1  0.861  0.336  0.539  1.0
  O  O9  1  0.361  0.164  0.461  1.0
  O  O10  1  0.139  0.836  0.961  1.0
  O  O11  1  0.164  0.461  0.361  1.0
  O  O12  1  0.961  0.139  0.836  1.0
  O  O13  1  0.461  0.361  0.164  1.0
  O  O14  1  0.336  0.539  0.861  1.0
  O  O15  1  0.539  0.861  0.336  1.0
  O  O16  1  0.152  0.152  0.152  1.0
  O  O17  1  0.348  0.848  0.652  1.0
  O  O18  1  0.652  0.348  0.848  1.0
  O  O19  1  0.848  0.652  0.348  1.0
  O  O20  1  0.639  0.664  0.039  1.0
  O  O21  1  0.039  0.639  0.664  1.0
  O  O22  1  0.664  0.039  0.639  1.0
  O  O23  1  0.836  0.961  0.139  1.0
[/CIF]
.