Spinel Princivalle F, Martignago F, Dal Negro A American Mineralogist 91 (2006) 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 = 650 C, ordering, t = 12 m _database_code_amcsd 0004097 8.1162 8.1162 8.1162 90 90 90 *Fd3m .125 .125 .125 atom x y z occ MgT .125 .125 .125 .797 AlT .125 .125 .125 .203 AlM .5 .5 .5 .675 MgM .5 .5 .5 .203 Cr3+M .5 .5 .5 .122 O .26197 .26197 .26197