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 = 1000 C
_database_code_amcsd 0008809
8.1791 8.1791 8.1791 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .242 .0187
MgT    .125   .125   .125  .758 .0187
AlM      .5     .5     .5  .796 .0168
MgM      .5     .5     .5 .1185 .0168
CrM      .5     .5     .5  .081 .0168
MnM      .5     .5     .5  .001 .0168
ZnM      .5     .5     .5 .0035 .0168
O    .26171 .26171 .26171       .0205