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 = 72 h _database_code_amcsd 0008940 8.1384 8.1384 8.1384 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlA .125 .125 .125 .18 .0074 Fe2+A .125 .125 .125 .61 .0074 Fe3+A .125 .125 .125 .01 .0074 MgA .125 .125 .125 .19 .0074 AlB .5 .5 .5 .88 .0047 Fe2+B .5 .5 .5 .045 .0047 Fe3+B .5 .5 .5 .025 .0047 MgB .5 .5 .5 .05 .0047 O .26340 .26340 .26340 .0085