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 = 650 C _database_code_amcsd 0008820 8.1440 8.1440 8.1440 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .18 .0128 FeT .125 .125 .125 .03 .0128 MgT .125 .125 .125 .781 .0128 AlM .5 .5 .5 .8675 .0118 FeM .5 .5 .5 .025 .0118 MgM .5 .5 .5 .107 .0118 O .26250 .26250 .26250 .0153