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-Cr, 3rd run, T = 600 C _database_code_amcsd 0008774 8.1335 8.1335 8.1335 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .122 .0135 MgT .125 .125 .125 .878 .0135 AlM .5 .5 .5 .903 .0106 MgM .5 .5 .5 .0625 .0106 CrM .5 .5 .5 .033 .0106 MnM .5 .5 .5 .0005 .0106 ZnM .5 .5 .5 .001 .0106 O .26342 .26342 .26342 .0111