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, 1st run, T = 400 C
_database_code_amcsd 0008797
8.1316 8.1316 8.1316 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .107 .0098
MgT    .125   .125   .125  .893 .0098
AlM      .5     .5     .5 .8635 .0082
MgM      .5     .5     .5  .051 .0082
CrM      .5     .5     .5  .081 .0082
MnM      .5     .5     .5  .001 .0082
ZnM      .5     .5     .5 .0035 .0082
O    .26348 .26348 .26348       .0088