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, 1st run, T = 450 C
_database_code_amcsd 0008768
8.1207 8.1207 8.1207 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .118 .0109
MgT    .125   .125   .125  .882 .0109
AlM      .5     .5     .5  .905 .0088
MgM      .5     .5     .5 .0605 .0088
CrM      .5     .5     .5  .033 .0088
MnM      .5     .5     .5 .0005 .0088
ZnM      .5     .5     .5  .001 .0088
O    .26348 .26348 .26348       .0091