AM_Spinel_531 Formula: Al2.635 Fe.08 Mg.274 O4 Name: Spinel Unit cell: 8.1281 8.1281 8.1281 90.0 90.0 90.0 , V=536.99 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, 1st run, T = 450 C