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 = 60 m _database_code_amcsd 0004084 8.0919 8.0919 8.0919 90 90 90 *Fd3m .125 .125 .125 atom x y z occ MgT .125 .125 .125 .862 AlT .125 .125 .125 .238 AlM .5 .5 .5 .7335 MgM .5 .5 .5 .238 Cr3+M .5 .5 .5 .0285 O .26201 .26201 .26201