Cristobalite HT (290 C) * SiO2 * Cubique 
7.06 7.06 7.06 90 90 90 F 6 N 
Si 0 0 0 .3 12 
Si .25 .25 .25 .3 12 
O .125 .125 .125 1.25 11 
O .125 .375 .375 1.25 11 
O .375 .125 .375 1.25 11 
O .375 .375 .125 1.25 11