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 = 700 C _database_code_amcsd 0008791 8.1502 8.1502 8.1502 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .202 .0135 MgT .125 .125 .125 .798 .0135 AlM .5 .5 .5 .833 .0131 MgM .5 .5 .5 .1005 .0131 CrM .5 .5 .5 .0615 .0131 MnM .5 .5 .5 .001 .0131 ZnM .5 .5 .5 .0035 .0131 O .26231 .26231 .26231 .0179