AM_Spinel_487 Formula: Al1.928 Mg1.003 Cr.066 Mn.001 Zn.002 O4 Name: Spinel Unit cell: 8.1168 8.1168 8.1168 90.0 90.0 90.0 , V=534.75 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-Cr, 1st run, T = 400 C