AM_SiO2_20 Formula: Si O2 Name: SiO2 Unit cell: 4.7209 4.5622 6.0394 90.9053 93.3589 105.9589 , V=124.78 Space group: P1 (1)

Boisen M B , Gibbs G V , Bukowinski M S T , Physics and Chemistry of Minerals , 21 (1994) p.269-284, Framework silica structures generated using simulated annealing, with a potential energy function based on an H6Si2O7 molecule, Sample: 21