Gahnite
Fregola R A, Skogby H, Bosi F, D'Ippolito V, Andreozzi G B, Halenius U
American Mineralogist 99 (2014) 2187-2195
Optical absorption spectroscopy study of the causes for color variations in natural
Fe-bearing gahnite: Insights from iron valency and site distribution data
Note: Sample Ni8967e
Locality: Jemaa, Kaduna, Nigeria
_database_code_amcsd 0020409
8.0954 8.0954 8.0954 90 90 90 *Fd-3m
.125 .125 .125
atom      x      y      z  occ   Uiso U(1,1) U(2,2) U(3,3)  U(1,2)  U(1,3)  U(2,3)
ZnT    .125   .125   .125  .91 .00440 .00440 .00440 .00440       0       0       0
FeT    .125   .125   .125  .09 .00440 .00440 .00440 .00440       0       0       0
AlM      .5     .5     .5  .99 .00354 .00354 .00354 .00354 -.00035 -.00035 -.00035
FeM      .5     .5     .5 .005 .00354 .00354 .00354 .00354 -.00035 -.00035 -.00035
MgM      .5     .5     .5 .005 .00354 .00354 .00354 .00354 -.00035 -.00035 -.00035
O    .26413 .26413 .26413      .00354 .00354 .00354 .00354 -.00023 -.00023 -.00023