AM_Spinel_490 Formula: Al1.928 Mg1.003 Cr.066 Mn.001 Zn.002 O4 Name: Spinel Unit cell: 8.1217 8.1217 8.1217 90.0 90.0 90.0 , V=535.72 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, 2nd run, T = 450 C