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-Fe, 3rd run, T = 550 C
_database_code_amcsd 0008818
8.1359 8.1359 8.1359 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .123 .0118
FeT    .125   .125   .125  .023 .0118
MgT    .125   .125   .125  .844 .0118
AlM      .5     .5     .5  .897 .0103
FeM      .5     .5     .5 .0285 .0103
MgM      .5     .5     .5 .0735 .0103
O    .26327 .26327 .26327       .0112