The compound described by SiO2 crystallizes in the cubic F4_132 space group. Si(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. 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) atoms. In the second O site, O(2) is bonded in a water-like geometry to two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.179
_cell_length_b   8.179
_cell_length_c   8.179
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   386.862
_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  0.367  0.125  0.625  1.0
  Si  Si1  1  0.883  0.125  0.367  1.0
  Si  Si2  1  0.125  0.625  0.367  1.0
  Si  Si3  1  0.367  0.883  0.125  1.0
  Si  Si4  1  0.125  0.883  0.625  1.0
  Si  Si5  1  0.125  0.367  0.883  1.0
  Si  Si6  1  0.625  0.883  0.367  1.0
  Si  Si7  1  0.625  0.125  0.883  1.0
  Si  Si8  1  0.883  0.625  0.125  1.0
  Si  Si9  1  0.625  0.367  0.125  1.0
  Si  Si10  1  0.883  0.367  0.625  1.0
  Si  Si11  1  0.367  0.625  0.883  1.0
  O  O12  1  0.288  0.962  0.625  1.0
  O  O13  1  0.288  0.625  0.125  1.0
  O  O14  1  0.962  0.288  0.125  1.0
  O  O15  1  0.658  0.342  0.342  1.0
  O  O16  1  0.908  0.592  0.908  1.0
  O  O17  1  0.592  0.908  0.592  1.0
  O  O18  1  0.962  0.125  0.625  1.0
  O  O19  1  0.342  0.658  0.658  1.0
  O  O20  1  0.288  0.125  0.962  1.0
  O  O21  1  0.125  0.288  0.625  1.0
  O  O22  1  0.658  0.658  0.342  1.0
  O  O23  1  0.592  0.908  0.908  1.0
  O  O24  1  0.125  0.625  0.962  1.0
  O  O25  1  0.342  0.342  0.658  1.0
  O  O26  1  0.908  0.908  0.592  1.0
  O  O27  1  0.342  0.658  0.342  1.0
  O  O28  1  0.658  0.342  0.658  1.0
  O  O29  1  0.625  0.125  0.288  1.0
  O  O30  1  0.125  0.962  0.288  1.0
  O  O31  1  0.592  0.592  0.908  1.0
  O  O32  1  0.625  0.962  0.125  1.0
  O  O33  1  0.962  0.625  0.288  1.0
  O  O34  1  0.908  0.592  0.592  1.0
  O  O35  1  0.625  0.288  0.962  1.0
[/CIF]
.
The compound described by SiO2 crystallizes in the cubic F4_132 space group. Si(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. 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) atoms. In the second O site, O(2) is bonded in a water-like geometry to two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.179
_cell_length_b   8.179
_cell_length_c   8.179
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   386.862
_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  0.367  0.125  0.625  1.0
  Si  Si1  1  0.883  0.125  0.367  1.0
  Si  Si2  1  0.125  0.625  0.367  1.0
  Si  Si3  1  0.367  0.883  0.125  1.0
  Si  Si4  1  0.125  0.883  0.625  1.0
  Si  Si5  1  0.125  0.367  0.883  1.0
  Si  Si6  1  0.625  0.883  0.367  1.0
  Si  Si7  1  0.625  0.125  0.883  1.0
  Si  Si8  1  0.883  0.625  0.125  1.0
  Si  Si9  1  0.625  0.367  0.125  1.0
  Si  Si10  1  0.883  0.367  0.625  1.0
  Si  Si11  1  0.367  0.625  0.883  1.0
  O  O12  1  0.288  0.962  0.625  1.0
  O  O13  1  0.288  0.625  0.125  1.0
  O  O14  1  0.962  0.288  0.125  1.0
  O  O15  1  0.658  0.342  0.342  1.0
  O  O16  1  0.908  0.592  0.908  1.0
  O  O17  1  0.592  0.908  0.592  1.0
  O  O18  1  0.962  0.125  0.625  1.0
  O  O19  1  0.342  0.658  0.658  1.0
  O  O20  1  0.288  0.125  0.962  1.0
  O  O21  1  0.125  0.288  0.625  1.0
  O  O22  1  0.658  0.658  0.342  1.0
  O  O23  1  0.592  0.908  0.908  1.0
  O  O24  1  0.125  0.625  0.962  1.0
  O  O25  1  0.342  0.342  0.658  1.0
  O  O26  1  0.908  0.908  0.592  1.0
  O  O27  1  0.342  0.658  0.342  1.0
  O  O28  1  0.658  0.342  0.658  1.0
  O  O29  1  0.625  0.125  0.288  1.0
  O  O30  1  0.125  0.962  0.288  1.0
  O  O31  1  0.592  0.592  0.908  1.0
  O  O32  1  0.625  0.962  0.125  1.0
  O  O33  1  0.962  0.625  0.288  1.0
  O  O34  1  0.908  0.592  0.592  1.0
  O  O35  1  0.625  0.288  0.962  1.0
[/CIF]
.