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 = 452 h _database_code_amcsd 0008948 8.1172 8.1172 8.1172 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlA .125 .125 .125 .21 .0082 Fe2+A .125 .125 .125 .35 .0082 Fe3+A .125 .125 .125 .19 .0082 MgA .125 .125 .125 .22 .0082 AlB .5 .5 .5 .83 .0063 Fe2+B .5 .5 .5 .04 .0063 Fe3+B .5 .5 .5 .06 .0063 MgB .5 .5 .5 .035 .0063 O .26178 .26178 .26178 .0108