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: M-Cr, 1st run, T = 28 C _database_code_amcsd 0008785 8.1018 8.1018 8.1018 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .113 .0054 MgT .125 .125 .125 .887 .0054 AlM .5 .5 .5 .8775 .0055 MgM .5 .5 .5 .056 .0055 CrM .5 .5 .5 .0615 .0055 MnM .5 .5 .5 .001 .0055 ZnM .5 .5 .5 .0035 .0055 O .26348 .26348 .26348 .0052