Cristobalite II
Dera P, Lazarz J D, Prakapenka V B, Barkley M, Downs R T
Physics and Chemistry of Minerals 38 (2011) 517-529
New insights into the high-pressure polymorphism of SiO2 cristobalite
Note: P = 7.4 GPa
Locality: Ellora Caves, India
_database_code_amcsd 0018350
7.894 4.456 8.582 90 119.7 90 P2_1/c
atom     x     y     z Uiso
Si1  .6274 .2767 .8492 .008
Si2  .8757 .9875 .7260 .011
O1   .8107 .1082 .8680 .008
O2   .6889 .4490 .0333 .017
O3   .4534 .0338 .8043 .016
O4   .0689 .1382 .7504 .014