The material structure described by SiO2 is low (alpha) Cristobalite-like structured and crystallizes in the tetragonal I-4 space group. Si(1) is bonded to two equivalent O(1) and two equivalent O(2) 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) atoms. In the second O site, O(2) 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   5.004
_cell_length_b   6.664
_cell_length_c   6.664
_cell_angle_alpha   81.898
_cell_angle_beta   67.945
_cell_angle_gamma   67.948
_symmetry_Int_Tables_number   1
_cell_volume   190.873
_cell_formula_units_Z   4
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  0.804  0.352  0.002  1.0
  Si  Si1  1  0.194  0.002  0.648  1.0
  Si  Si2  1  0.843  0.998  0.352  1.0
  Si  Si3  1  0.159  0.648  0.998  1.0
  O  O4  1  0.918  0.523  0.065  1.0
  O  O5  1  0.559  0.935  0.522  1.0
  O  O6  1  0.016  0.065  0.478  1.0
  O  O7  1  0.086  0.792  0.200  1.0
  O  O8  1  0.078  0.208  0.800  1.0
  O  O9  1  0.714  0.200  0.208  1.0
  O  O10  1  0.506  0.477  0.935  1.0
  O  O11  1  0.121  0.800  0.792  1.0
[/CIF]
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The material structure described by SiO2 is low (alpha) Cristobalite-like structured and crystallizes in the tetragonal I-4 space group. Si(1) is bonded to two equivalent O(1) and two equivalent O(2) 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) atoms. In the second O site, O(2) 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   5.004
_cell_length_b   6.664
_cell_length_c   6.664
_cell_angle_alpha   81.898
_cell_angle_beta   67.945
_cell_angle_gamma   67.948
_symmetry_Int_Tables_number   1
_cell_volume   190.873
_cell_formula_units_Z   4
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  0.804  0.352  0.002  1.0
  Si  Si1  1  0.194  0.002  0.648  1.0
  Si  Si2  1  0.843  0.998  0.352  1.0
  Si  Si3  1  0.159  0.648  0.998  1.0
  O  O4  1  0.918  0.523  0.065  1.0
  O  O5  1  0.559  0.935  0.522  1.0
  O  O6  1  0.016  0.065  0.478  1.0
  O  O7  1  0.086  0.792  0.200  1.0
  O  O8  1  0.078  0.208  0.800  1.0
  O  O9  1  0.714  0.200  0.208  1.0
  O  O10  1  0.506  0.477  0.935  1.0
  O  O11  1  0.121  0.800  0.792  1.0
[/CIF]
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