Cristobalite
Matsui M, Sato T, Funamori N
American Mineralogist 99 (2014) 184-189
Crystal structures and stabilities of cristobalite-helium phases at high pressures
Note: P = 10 GPa
Locality: calculated structure
_database_code_amcsd 0020170
8.062 4.797 9.491 90 120.43 90 P2_1/c
atom     x     y     z
Si1  .6234 .3883 .8382
Si2  .8726 .1215 .7119
O1   .8001 .2641 .8249
O2   .6910 .4121 .0293
O3   .4354 .1912 .7477
O4   .0373 .3184 .7146
He1  .6328 .5935 .5320
He2  .1379 .3315 .5136