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, 3rd run, T = 600 C _database_code_amcsd 0008789 8.1419 8.1419 8.1419 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .126 .0126 MgT .125 .125 .125 .874 .0126 AlM .5 .5 .5 .871 .0112 MgM .5 .5 .5 .0625 .0112 CrM .5 .5 .5 .0615 .0112 MnM .5 .5 .5 .001 .0112 ZnM .5 .5 .5 .0035 .0112 O .26331 .26331 .26331 .0135