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 [P-31m]
_cell_length_a [11.4536]
_cell_length_b [11.4536]
_cell_length_c [4.4206]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [162]
_chemical_formula_structural [SiO2]
_chemical_formula_sum '[Si12 O24]'
_cell_volume [502.2166]
_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  0.1493  0.4592  0.2194  1
  O  O1  6  0.0000  0.3752  0.3637  1
  O  O2  6  0.1601  0.5801  0.0000  1
  O  O3  6  0.1820  0.3640  0.0000  1
  O  O4  6  0.2544  0.5088  0.5000  1
]