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, 1st run, T = 200 C
_database_code_amcsd 0008811
8.1092 8.1092 8.1092 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .126 .0070
FeT    .125   .125   .125  .013 .0070
MgT    .125   .125   .125   .85 .0070
AlM      .5     .5     .5 .8955 .0059
FeM      .5     .5     .5  .034 .0059
MgM      .5     .5     .5  .069 .0059
O    .26329 .26329 .26329       .0062