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 Sp2781_6c
Locality: Migiandone mine, Val d'Ossola, Italy
_database_code_amcsd 0020411
8.1103 8.1103 8.1103 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  .70 .00611 .00611 .00611 .00611       0       0       0
FeT    .125   .125   .125  .25 .00611 .00611 .00611 .00611       0       0       0
FeT    .125   .125   .125  .05 .00611 .00611 .00611 .00611       0       0       0
AlM      .5     .5     .5  .96 .00510 .00510 .00510 .00510 -.00033 -.00033 -.00033
Fe3+M    .5     .5     .5 .005 .00510 .00510 .00510 .00510 -.00033 -.00033 -.00033
MgM      .5     .5     .5 .015 .00510 .00510 .00510 .00510 -.00033 -.00033 -.00033
Fe2+M    .5     .5     .5  .02 .00510 .00510 .00510 .00510 -.00033 -.00033 -.00033
O    .26440 .26440 .26440      .00510 .00510 .00510 .00510 -.00025 -.00025 -.00025