Ringwoodite Smyth J R, Holl C M, Frost D J, Jacobsen S D, Langenhorst F, McCammon C A American Mineralogist 88 (2003) 1402-1407 Structural systematics of hydrous ringwoodite and water in Earth's interior Sample: Ringby4 _database_code_amcsd 0003158 8.0633 8.0633 8.0633 90 90 90 *Fd3m .125 .125 .125 atom x y z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) SiTet .125 .125 .125 .00426 .00426 .00426 0 0 0 MgOct .5 .5 .5 .998 .00516 .00516 .00516 -.00058 -.00058 -.00058 O .24391 .24391 .24391 .00459 .00459 .00459 -.00044 -.00044 -.00044