The structure described by SiO2 is quartz (beta)-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(4), and two equivalent O(2) atoms 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 one Si(1) and one Si(2) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(2) 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(2) atoms. is represented by the CIF card [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.258
_cell_length_b   11.262
_cell_length_c   11.262
_cell_angle_alpha   78.030
_cell_angle_beta   62.909
_cell_angle_gamma   62.909
_symmetry_Int_Tables_number   1
_cell_volume   1031.298
_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  0.359  0.281  0.500  1.0
  Si  Si1  1  0.859  0.281  0.500  1.0
  Si  Si2  1  0.889  0.845  0.376  1.0
  Si  Si3  1  0.734  0.376  0.155  1.0
  Si  Si4  1  0.141  0.500  0.719  1.0
  Si  Si5  1  0.641  0.719  0.500  1.0
  Si  Si6  1  0.266  0.845  0.624  1.0
  Si  Si7  1  0.111  0.155  0.624  1.0
  Si  Si8  1  0.889  0.376  0.845  1.0
  Si  Si9  1  0.141  0.719  0.500  1.0
  Si  Si10  1  0.641  0.500  0.719  1.0
  Si  Si11  1  0.266  0.624  0.845  1.0
  Si  Si12  1  0.734  0.155  0.376  1.0
  Si  Si13  1  0.359  0.500  0.281  1.0
  Si  Si14  1  0.859  0.500  0.281  1.0
  Si  Si15  1  0.111  0.624  0.155  1.0
  O  O16  1  0.241  0.759  0.759  1.0
  O  O17  1  0.735  0.812  0.463  1.0
  O  O18  1  0.289  0.374  0.626  1.0
  O  O19  1  0.711  0.626  0.374  1.0
  O  O20  1  0.546  0.188  0.463  1.0
  O  O21  1  0.831  0.000  0.337  1.0
  O  O22  1  0.802  0.463  0.188  1.0
  O  O23  1  0.010  0.188  0.537  1.0
  O  O24  1  0.711  0.374  0.626  1.0
  O  O25  1  0.198  0.812  0.537  1.0
  O  O26  1  0.454  0.537  0.812  1.0
  O  O27  1  0.990  0.812  0.463  1.0
  O  O28  1  0.000  0.759  0.241  1.0
  O  O29  1  0.759  0.241  0.241  1.0
  O  O30  1  0.086  0.626  0.626  1.0
  O  O31  1  0.802  0.188  0.463  1.0
  O  O32  1  0.663  0.626  0.626  1.0
  O  O33  1  0.169  0.000  0.663  1.0
  O  O34  1  0.265  0.537  0.188  1.0
  O  O35  1  0.735  0.463  0.812  1.0
  O  O36  1  0.000  0.241  0.759  1.0
  O  O37  1  0.831  0.337  0.000  1.0
  O  O38  1  0.265  0.188  0.537  1.0
  O  O39  1  0.914  0.374  0.374  1.0
  O  O40  1  0.198  0.537  0.812  1.0
  O  O41  1  0.990  0.463  0.812  1.0
  O  O42  1  0.546  0.463  0.188  1.0
  O  O43  1  0.454  0.812  0.537  1.0
  O  O44  1  0.010  0.537  0.188  1.0
  O  O45  1  0.169  0.663  0.000  1.0
  O  O46  1  0.289  0.626  0.374  1.0
  O  O47  1  0.337  0.374  0.374  1.0
[/CIF]
.
The structure described by SiO2 is quartz (beta)-like structured and crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to two equivalent O(2) and two equivalent O(3) atoms to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(4), and two equivalent O(2) atoms 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 one Si(1) and one Si(2) atom. In the second O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(2) 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(2) atoms. is represented by the CIF card [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   10.258
_cell_length_b   11.262
_cell_length_c   11.262
_cell_angle_alpha   78.030
_cell_angle_beta   62.909
_cell_angle_gamma   62.909
_symmetry_Int_Tables_number   1
_cell_volume   1031.298
_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  0.359  0.281  0.500  1.0
  Si  Si1  1  0.859  0.281  0.500  1.0
  Si  Si2  1  0.889  0.845  0.376  1.0
  Si  Si3  1  0.734  0.376  0.155  1.0
  Si  Si4  1  0.141  0.500  0.719  1.0
  Si  Si5  1  0.641  0.719  0.500  1.0
  Si  Si6  1  0.266  0.845  0.624  1.0
  Si  Si7  1  0.111  0.155  0.624  1.0
  Si  Si8  1  0.889  0.376  0.845  1.0
  Si  Si9  1  0.141  0.719  0.500  1.0
  Si  Si10  1  0.641  0.500  0.719  1.0
  Si  Si11  1  0.266  0.624  0.845  1.0
  Si  Si12  1  0.734  0.155  0.376  1.0
  Si  Si13  1  0.359  0.500  0.281  1.0
  Si  Si14  1  0.859  0.500  0.281  1.0
  Si  Si15  1  0.111  0.624  0.155  1.0
  O  O16  1  0.241  0.759  0.759  1.0
  O  O17  1  0.735  0.812  0.463  1.0
  O  O18  1  0.289  0.374  0.626  1.0
  O  O19  1  0.711  0.626  0.374  1.0
  O  O20  1  0.546  0.188  0.463  1.0
  O  O21  1  0.831  0.000  0.337  1.0
  O  O22  1  0.802  0.463  0.188  1.0
  O  O23  1  0.010  0.188  0.537  1.0
  O  O24  1  0.711  0.374  0.626  1.0
  O  O25  1  0.198  0.812  0.537  1.0
  O  O26  1  0.454  0.537  0.812  1.0
  O  O27  1  0.990  0.812  0.463  1.0
  O  O28  1  0.000  0.759  0.241  1.0
  O  O29  1  0.759  0.241  0.241  1.0
  O  O30  1  0.086  0.626  0.626  1.0
  O  O31  1  0.802  0.188  0.463  1.0
  O  O32  1  0.663  0.626  0.626  1.0
  O  O33  1  0.169  0.000  0.663  1.0
  O  O34  1  0.265  0.537  0.188  1.0
  O  O35  1  0.735  0.463  0.812  1.0
  O  O36  1  0.000  0.241  0.759  1.0
  O  O37  1  0.831  0.337  0.000  1.0
  O  O38  1  0.265  0.188  0.537  1.0
  O  O39  1  0.914  0.374  0.374  1.0
  O  O40  1  0.198  0.537  0.812  1.0
  O  O41  1  0.990  0.463  0.812  1.0
  O  O42  1  0.546  0.463  0.188  1.0
  O  O43  1  0.454  0.812  0.537  1.0
  O  O44  1  0.010  0.537  0.188  1.0
  O  O45  1  0.169  0.663  0.000  1.0
  O  O46  1  0.289  0.626  0.374  1.0
  O  O47  1  0.337  0.374  0.374  1.0
[/CIF]
.