Hercynite Lavina B, Princivalle F, Della Giusta A Physics and Chemistry of Minerals 32 (2005) 83-88 Controlled time-temperature oxidation reaction in a synthetic Mg-hercynite Spinel structure Sample: Annealing temperature and time T = 600 C, t = 1196 h _database_code_amcsd 0008951 8.0989 8.0989 8.0989 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlA .125 .125 .125 .26 .0085 Fe2+A .125 .125 .125 .16 .0085 Fe3+A .125 .125 .125 .32 .0085 MgA .125 .125 .125 .22 .0085 AlB .5 .5 .5 .78 .0074 Fe2+B .5 .5 .5 .025 .0074 Fe3+B .5 .5 .5 .095 .0074 MgB .5 .5 .5 .035 .0074 O .26048 .26048 .26048 .0121