AM_Hercynite_61 Formula: Al1.94 Fe.76 Mg.29 O4 Name: Hercynite Unit cell: 8.1384 8.1384 8.1384 90.0 90.0 90.0 , V=539.04 Space group: FD3M (227)

Lavina B , Princivalle F , Della Giusta A , Physics and Chemistry of Minerals , 32 (2005) p.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