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 0008780 8.1019 8.1019 8.1019 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .114 .0051 MgT .125 .125 .125 .886 .0051 AlM .5 .5 .5 .877 .0055 MgM .5 .5 .5 .0565 .0558 CrM .5 .5 .5 .0615 .0558 MnM .5 .5 .5 .001 .0558 ZnM .5 .5 .5 .0035 .0558 O .26346 .26346 .26346 .0057