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 = 800 C
_database_code_amcsd 0008807
8.1655 8.1655 8.1655 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .204 .0162
MgT    .125   .125   .125  .796 .0162
AlM      .5     .5     .5  .815 .0140
MgM      .5     .5     .5 .0995 .0140
CrM      .5     .5     .5  .081 .0140
MnM      .5     .5     .5  .001 .0140
ZnM      .5     .5     .5 .0035 .0140
O    .26221 .26221 .26221       .0166