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 = 900 C _database_code_amcsd 0008793 8.1658 8.1658 8.1658 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .263 .0167 MgT .125 .125 .125 .737 .0167 AlM .5 .5 .5 .8025 .0158 MgM .5 .5 .5 .131 .0158 CrM .5 .5 .5 .0615 .0158 MnM .5 .5 .5 .001 .0158 ZnM .5 .5 .5 .0035 .0158 O .26151 .26151 .26151 .0209