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, 2nd run, T = 500 C
_database_code_amcsd 0008771
8.1256 8.1256 8.1256 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .132 .0113
MgT    .125   .125   .125  .868 .0113
AlM      .5     .5     .5  .898 .0094
MgM      .5     .5     .5 .0675 .0094
CrM      .5     .5     .5  .033 .0094
MnM      .5     .5     .5 .0005 .0094
ZnM      .5     .5     .5  .001 .0094
O    .26329 .26329 .26329       .0102