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 = 600 C _database_code_amcsd 0008819 8.1403 8.1403 8.1403 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .148 .0121 FeT .125 .125 .125 .024 .0121 MgT .125 .125 .125 .819 .0121 AlM .5 .5 .5 .8845 .0112 FeM .5 .5 .5 .028 .0112 MgM .5 .5 .5 .087 .0112 O .26292 .26292 .26292 .0134