# SiO2 beta-cristobalite (tetragonal distortion, tI12)
# Reduces to symmetric form for x=0 and c/a=sqrt(2)=1.41 (here is 1.39)
data_nolabel
_chemical_formula_sum           'SiO2'
_cell_length_a                  5.095
_cell_length_b                  5.095
_cell_length_c                  7.102
_cell_angle_alpha               90
_cell_angle_beta                90
_cell_angle_gamma               90
_cell_formula_units_Z           4
_symmetry_space_group_name_H-M  'I-42d'
loop_
_atom_site_type_symbol
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_Wyckoff_symbol
 Si    0     0    0    4a
 O   -.185  .25  .125  8d
