Osumilite Seryotkin Y V, Sokol E V, Bakakin V V, Likhacheva A Y European Journal of Mineralogy 20 (2008) 191-198 Pyrometamorphic osumilite: occurrence, paragenesis, and crystal structure as compared to cordierite Locality: South Urals, Russia _database_code_amcsd 0007256 10.0999 10.0999 14.3355 90 90 120 P6/mcc atom x y z occ Uiso SiT1 .24852 .35307 .39220 .84 .0105 AlT1 .24852 .35307 .39220 .16 .0105 AlT2 .5 .5 .25 .96 .0129 FeT2 .5 .5 .25 .04 .0129 O1 .1220 .4080 0 .0206 O2 .2165 .2851 .13129 .0254 O3 .13905 .49343 .17921 .0143 MgA 1/3 2/3 .25 .89 .0121 FeA 1/3 2/3 .25 .07 .0121 MnA 1/3 2/3 .25 .02 .0121 TiA 1/3 2/3 .25 .02 .0121 KC 0 0 .25 .829 .0362 NaB 1/3 2/3 .019 .026 .05