Osumilite Armbruster T, Oberhansli R American Mineralogist 73 (1988) 585-594 Crystal chemistry of double-ring silicates: Structural, chemical, and optical variation in osumilites Japan-Hayasaki _database_code_amcsd 0001154 10.150 10.150 14.286 90 90 120 P6/mcc atom x y z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) KC 0 0 .25 .76 .031 .031 .034 .0155 0 0 FeA 1/3 2/3 .25 .58 .0066 .0066 .0097 .0033 0 0 MgA 1/3 2/3 .25 .42 .0066 .0066 .0097 .0033 0 0 Si1 .24738 .35055 .39187 .86 .088 .0105 .0069 .0056 .0014 .0014 Al1 .24738 .35055 .39187 .14 .088 .0105 .0069 .0056 .0014 .0014 Fe2 .5 .5 .25 .07 .0105 .0105 .0069 .0080 0 0 Al2 .5 .5 .25 .93 .0105 .0105 .0069 .0080 0 0 O1 .1198 .4041 0 .027 .019 .0080 .010 0 0 O2 .2144 .2830 .1319 .025 .035 .0233 .0239 -.0011 -.0036 O3 .1371 .4905 .1789 .0159 .0167 .0123 .0098 -.0030 -.0048