data_global
_chemical_name_mineral 'Cristobalite'
loop_
_publ_author_name
'Dera P'
'Lazarz J D'
'Prakapenka V B'
'Barkley M'
'Downs R T'
_journal_name_full 'Physics and Chemistry of Minerals'
_journal_volume 38 
_journal_year 2011
_journal_page_first 517
_journal_page_last 529
_publ_section_title
;
 New insights into the high-pressure polymorphism of SiO2 cristobalite
 Note: P = 5.4 GPa
;
_database_code_amcsd 0018345
_chemical_compound_source 'Ellora Caves, India'
_chemical_formula_sum 'Si O2'
_cell_length_a 4.682
_cell_length_b 4.682
_cell_length_c 6.311
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 138.344
_exptl_crystal_density_diffrn      2.885
_symmetry_space_group_name_H-M 'P 41 21 2'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'y,x,-z'
  '1/2-y,1/2+x,1/4+z'
  '1/2-x,1/2+y,1/4-z'
  '-x,-y,1/2+z'
  '-y,-x,1/2-z'
  '1/2+y,1/2-x,3/4+z'
  '1/2+x,1/2-y,3/4-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Si   0.33160   0.33160   0.00000   0.00900
O   0.22970   0.16480   0.21190   0.00500