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 = 860 h _database_code_amcsd 0008950 8.1045 8.1045 8.1045 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlA .125 .125 .125 .23 .0088 Fe2+A .125 .125 .125 .22 .0088 Fe3+A .125 .125 .125 .28 .0088 MgA .125 .125 .125 .24 .0088 AlB .5 .5 .5 .805 .0075 Fe2+B .5 .5 .5 .035 .0075 Fe3+B .5 .5 .5 .085 .0075 MgB .5 .5 .5 .025 .0075 O .26078 .26078 .26078 .0119