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: Ch1, annealed at T = 850 C, ordering, t = 1.50 m _database_code_amcsd 0004081 8.0909 8.0909 8.0909 90 90 90 *Fd3m .125 .125 .125 atom x y z occ MgT .125 .125 .125 .748 AlT .125 .125 .125 .252 AlM .5 .5 .5 .7195 MgM .5 .5 .5 .252 Cr3+M .5 .5 .5 .0285 O .26182 .26182 .26182