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 = 356 h _database_code_amcsd 0008947 8.1198 8.1198 8.1198 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlA .125 .125 .125 .19 .0083 Fe2+A .125 .125 .125 .36 .0083 Fe3+A .125 .125 .125 .20 .0083 MgA .125 .125 .125 .23 .0083 AlB .5 .5 .5 .845 .0061 Fe2+B .5 .5 .5 .05 .0061 Fe3+B .5 .5 .5 .045 .0061 MgB .5 .5 .5 .03 .0061 O .26220 .26220 .26220 .0107