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-Fe, 3rd run, T = 700 C _database_code_amcsd 0008821 8.1469 8.1469 8.1469 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .221 .0139 FeT .125 .125 .125 .037 .0139 MgT .125 .125 .125 .733 .0139 AlM .5 .5 .5 .8465 .0127 FeM .5 .5 .5 .0215 .0127 MgM .5 .5 .5 .1315 .0127 O .26190 .26190 .26190 .0167