SiO2
Boisen M B, Gibbs G V, Bukowinski M S T
Physics and Chemistry of Minerals 21 (1994) 269-284
Framework silica structures generated using simulated annealing
with a potential energy function based on an H6Si2O7 molecule
Sample: 4
_database_code_amcsd 0007869
4.9329 4.9329 6.4645 90 90 90 P4_12_12
atom      x      y      z
Si   .68229 .68229     .5
O    .36457 .73165 .44807