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 = 800 C _database_code_amcsd 0008822 8.1547 8.1547 8.1547 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .242 .0148 FeT .125 .125 .125 .036 .0148 MgT .125 .125 .125 .714 .0148 AlM .5 .5 .5 .836 .0143 FeM .5 .5 .5 .022 .0143 MgM .5 .5 .5 .141 .0143 O .26159 .26159 .26159 .0186