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, disordering, t = 840 m _database_code_amcsd 0004090 8.1175 8.1175 8.1175 90 90 90 *Fd3m .125 .125 .125 atom x y z occ MgT .125 .125 .125 .871 AlT .125 .125 .125 .129 AlM .5 .5 .5 .749 MgM .5 .5 .5 .129 Cr3+M .5 .5 .5 .122 O .26303 .26303 .26303