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 = 236 h _database_code_amcsd 0008943 8.1366 8.1366 8.1366 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlA .125 .125 .125 .17 .0084 Fe2+A .125 .125 .125 .54 .0084 Fe3+A .125 .125 .125 .06 .0084 MgA .125 .125 .125 .23 .0084 AlB .5 .5 .5 .88 .0062 Fe2+B .5 .5 .5 .065 .0062 Fe3+B .5 .5 .5 .02 .0062 MgB .5 .5 .5 .03 .0062 O .26316 .26316 .26316 .0101