data_global
_amcsd_formula_title 'SiO2'
loop_
_publ_author_name
'Boisen M B'
'Gibbs G V'
'Bukowinski M S T'
_journal_name_full 'Physics and Chemistry of Minerals'
_journal_volume 21 
_journal_year 1994
_journal_page_first 269
_journal_page_last 284
_publ_section_title
;
 Framework silica structures generated using simulated annealing
 with a potential energy function based on an H6Si2O7 molecule
 Sample: 17
;
_database_code_amcsd 0007882
_chemical_formula_sum 'Si O2'
_cell_length_a 5.5569
_cell_length_b 5.2463
_cell_length_c 5.9716
_cell_angle_alpha 88.5667
_cell_angle_beta 114.2259
_cell_angle_gamma 94.0951
_cell_volume 158.353
_exptl_crystal_density_diffrn      2.520
_symmetry_space_group_name_H-M 'P 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Si1   0.13331   0.18553   0.66792
Si2   0.67711   0.07354   0.19415
Si3   0.29764   0.69248   0.98863
Si4   0.18671   0.26282   0.20830
O1   0.17799   0.96268   0.87359
O2   0.61266   0.76700   0.14156
O3   0.22608   0.47365   0.78015
O4   0.87320   0.17109   0.06243
O5   0.82147   0.15236   0.48423
O6   0.38202   0.18349   0.08008
O7   0.19661   0.57335   0.19208
O8   0.28772   0.15463   0.49050