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, 1st run, T = 200 C
_database_code_amcsd 0008796
8.1180 8.1180 8.1180 90 90 90 *Fd3m
.125 .125 .125
atom      x      y      z   occ Uiso
AlT    .125   .125   .125   .12 .0068
MgT    .125   .125   .125   .88 .0068
AlM      .5     .5     .5  .857 .0063
MgM      .5     .5     .5 .0575 .0063
CrM      .5     .5     .5  .081 .0063
MnM      .5     .5     .5  .001 .0063
ZnM      .5     .5     .5 .0035 .0063
O    .26331 .26331 .26331       .0065