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 = 308 h _database_code_amcsd 0008946 8.1291 8.1291 8.1291 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlA .125 .125 .125 .21 .0084 Fe2+A .125 .125 .125 .49 .0084 Fe3+A .125 .125 .125 .10 .0084 MgA .125 .125 .125 .18 .0084 AlB .5 .5 .5 .855 .0057 Fe2+B .5 .5 .5 .04 .0057 Fe3+B .5 .5 .5 .04 .0057 MgB .5 .5 .5 .055 .0057 O .26255 .26255 .26255 .0103