Spinel Martignago F, Dal Negro A, Carbonin S Physics and Chemistry of Minerals 30 (2003) 401-408 How Cr3+ and Fe3+ affect Mg-Al order-disorder transformation at high temperature in natural spinels Sample: L-Cr, 1st run, T = 25 C _database_code_amcsd 0008770 8.0917 8.0917 8.0917 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .119 .0052 MgT .125 .125 .125 .881 .0052 AlM .5 .5 .5 .9045 .0043 MgM .5 .5 .5 .061 .0043 CrM .5 .5 .5 .033 .0043 MnM .5 .5 .5 .0005 .0043 ZnM .5 .5 .5 .001 .0043 O .26346 .26346 .26346 .0043