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, 1st run, T = 25 C
_database_code_amcsd 0008765
8.0914 8.0914 8.0914 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .121 .0050
MgT    .125   .125   .125  .879 .0050
AlM      .5     .5     .5 .9035 .0042
MgM      .5     .5     .5  .062 .0042
CrM      .5     .5     .5  .033 .0042
MnM      .5     .5     .5 .0005 .0042
ZnM      .5     .5     .5  .001 .0042
O    .26344 .26344 .26344       .0046