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, 1st run, T = 25 C _database_code_amcsd 0008815 8.0987 8.0987 8.0987 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .131 .0044 FeT .125 .125 .125 .007 .0044 MgT .125 .125 .125 .852 .0044 AlM .5 .5 .5 .893 .0045 FeM .5 .5 .5 .0365 .0045 MgM .5 .5 .5 .0695 .0045 O .26325 .26325 .26325 .0049