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 = 500 C, t = 116 h _database_code_amcsd 0008941 8.1380 8.1380 8.1380 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlA .125 .125 .125 .16 .0074 Fe2+A .125 .125 .125 .60 .0074 Fe3+A .125 .125 .125 .03 .0074 MgA .125 .125 .125 .21 .0074 AlB .5 .5 .5 .89 .0044 Fe2+B .5 .5 .5 .055 .0044 Fe3+B .5 .5 .5 .01 .0044 MgB .5 .5 .5 .045 .0044 O .26356 .26356 .26356 .0083