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: H-Cr, 1st run, T = 25 C _database_code_amcsd 0008800 8.1085 8.1085 8.1085 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .123 .0050 MgT .125 .125 .125 .877 .0050 AlM .5 .5 .5 .8555 .0045 MgM .5 .5 .5 .059 .0045 CrM .5 .5 .5 .081 .0045 MnM .5 .5 .5 .001 .0045 ZnM .5 .5 .5 .0035 .0045 O .26327 .26327 .26327 .0056