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 = 450 C
_database_code_amcsd 0008772
8.1217 8.1217 8.1217 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ  Uiso
AlT    .125   .125   .125  .126 .0105
MgT    .125   .125   .125  .874 .0105
AlM      .5     .5     .5  .901 .0090
MgM      .5     .5     .5 .0645 .0090
CrM      .5     .5     .5  .033 .0090
MnM      .5     .5     .5 .0005 .0090
ZnM      .5     .5     .5  .001 .0090
O    .26337 .26337 .26337       .0093