AM_Spinel_527 Formula: Al1.834 Mg.995 Cr.162 Mn.002 Zn.007 O4 Name: Spinel Unit cell: 8.1791 8.1791 8.1791 90.0 90.0 90.0 , V=547.16 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: H-Cr, 3rd run, T = 1000 C