Ringwoodite
Baur W H
American Mineralogist 57 (1972) 709-731
Computer-simulated crystal structures of observed and hypothetical Mg2SiO4
polymorphs of low and high density
normal
Locality: hypothetical
_database_code_amcsd 0000278
8.12 8.12 8.12 90 90 90 *Fd3m
.125 .125 .125
atom     x     y     z
Si    .125  .125  .125
Mg      .5    .5    .5
O    .2416 .2416 .2416