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, 2nd run, T = 500 C _database_code_amcsd 0008816 8.1318 8.1318 8.1318 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .123 .0110 FeT .125 .125 .125 .015 .0110 MgT .125 .125 .125 .853 .0110 AlM .5 .5 .5 .8975 .0096 FeM .5 .5 .5 .0325 .0096 MgM .5 .5 .5 .069 .0096 O .26331 .26331 .26331 .0104