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_6a Locality: Migiandone mine, Val d'Ossola, Italy _database_code_amcsd 0020410 8.0944 8.0944 8.0944 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 .00538 .00538 .00538 .00538 0 0 0 FeT .125 .125 .125 .09 .00538 .00538 .00538 .00538 0 0 0 AlM .5 .5 .5 .99 .00455 .00455 .00455 .00455 -.00033 -.00033 -.00033 FeM .5 .5 .5 .005 .00455 .00455 .00455 .00455 -.00033 -.00033 -.00033 MgM .5 .5 .5 .005 .00455 .00455 .00455 .00455 -.00033 -.00033 -.00033 O .26420 .26420 .26420 .00450 .00450 .00450 .00450 -.00022 -.00022 -.00022