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: L-Cr, 3rd run, T = 650 C _database_code_amcsd 0008775 8.1381 8.1381 8.1381 90 90 90 *Fd3m .125 .125 .125 atom x y z occ Uiso AlT .125 .125 .125 .129 .0134 MgT .125 .125 .125 .871 .0134 AlM .5 .5 .5 .8995 .0113 MgM .5 .5 .5 .066 .0113 CrM .5 .5 .5 .033 .0113 MnM .5 .5 .5 .0005 .0113 ZnM .5 .5 .5 .001 .0113 O .26333 .26333 .26333 .0124