AM_Spinel_309 Formula: Mg1.211 Al1.545 Cr.244 O4 Name: Spinel Unit cell: 8.116 8.116 8.116 90.0 90.0 90.0 , V=534.60 Space group: FD3M (227)

Princivalle F , Martignago F , Dal Negro A , American Mineralogist , 91 (2006) p.313-318, Kinetics of cation ordering in natural Mg(Al,Cr3+)2O4 spinels, Locality: Olkhon metamorphic complex, Lake Baikal, Russia, Sample: Sc, annealed at T = 850 C, ordering, t = 0.50 m