AM_Spinel_538 Formula: Al1.915 Fe.08 Mg.995 O4 Name: Spinel Unit cell: 8.144 8.144 8.144 90.0 90.0 90.0 , V=540.15 Space group: FD3M (227)

Martignago F , Dal Negro A , Carbonin S , Physics and Chemistry of Minerals , 30 (2003) p.401-408, How Cr3+ and Fe3+ affect Mg-Al order-disorder transformation at high temperature, in natural spinels, Sample: L-Fe, 3rd run, T = 650 C