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, 2nd run, T = 450 C
_database_code_amcsd 0008802
8.1358 8.1358 8.1358 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .099 .0105
MgT    .125   .125   .125  .901 .0105
AlM      .5     .5     .5 .8675 .0088
MgM      .5     .5     .5  .047 .0088
CrM      .5     .5     .5  .081 .0088
MnM      .5     .5     .5  .001 .0088
ZnM      .5     .5     .5 .0035 .0088
O    .26358 .26358 .26358       .0098