AM_SiO2_21 Formula: Si O2 Name: SiO2 Unit cell: 4.2166 4.0206 7.6423 90.0 119.6668 90.0 , V=112.58 Space group: P1C1 (7)

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: 22