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, 3rd run, T = 600 C _database_code_amcsd 0008804 8.1482 8.1482 8.1482 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .111 .0134 MgT .125 .125 .125 .889 .0134 AlM .5 .5 .5 .8615 .0107 MgM .5 .5 .5 .053 .0107 CrM .5 .5 .5 .081 .0107 MnM .5 .5 .5 .001 .0107 ZnM .5 .5 .5 .0035 .0107 O .26342 .26342 .26342 .0123