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 = 4 GPa
Locality: calculated structure
_database_code_amcsd 0020171
9.080 9.080 9.080 31.809 31.809 31.809 R-3c
atom     x     y     z
Si   .5622 .5622 .5622
O1      .5    .5    .5
O2   .8523 .6477   .25
He   .8234 .8234 .8234