data_[Si12O24]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P6_422]
_cell_length_a [6.8662]
_cell_length_b [6.8662]
_cell_length_c [13.5881]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [181]
_chemical_formula_structural [SiO2]
_chemical_formula_sum '[Si12 O24]'
_cell_volume [554.7872]
_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  12  0.1773  0.4050  0.6178  1
  O  O1  6  0.0000  0.1835  0.3333  1
  O  O2  6  0.0000  0.5000  0.0296  1
  O  O3  6  0.1877  0.8123  0.1667  1
  O  O4  6  0.2126  0.6063  0.3333  1
]