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 = 260 h _database_code_amcsd 0008945 8.1329 8.1329 8.1329 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlA .125 .125 .125 .18 .0074 Fe2+A .125 .125 .125 .53 .0074 Fe3+A .125 .125 .125 .07 .0074 MgA .125 .125 .125 .22 .0074 AlB .5 .5 .5 .865 .0047 Fe2+B .5 .5 .5 .05 .0047 Fe3+B .5 .5 .5 .035 .0047 MgB .5 .5 .5 .035 .0047 O .26292 .26292 .26292 .0090