AM_Spinel_502 Formula: Al1.868 Mg.999 Cr.123 Mn.002 Zn.007 O4 Name: Spinel Unit cell: 8.1265 8.1265 8.1265 90.0 90.0 90.0 , V=536.67 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: M-Cr, 1st run, T = 400 C