Osumilite
Armbruster T, Oberhansli R
American Mineralogist 73 (1988) 585-594
Crystal chemistry of double-ring silicates: Structural, chemical, and optical
variation in osumilites
Sample: Oregon
_database_code_amcsd 0001156
10.137 10.137 14.308 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 .69   .030   .030   .032   .015      0      0
FeA     1/3    2/3    .25 .51  .0073  .0073  .0100 .00365      0      0
MgA     1/3    2/3    .25 .49  .0073  .0073  .0100 .00365      0      0
Si1  .24775 .35119 .39208 .86  .0099  .0118  .0077  .0062  .0012  .0011
Al1  .24775 .35119 .39208 .14  .0099  .0118  .0077  .0062  .0012  .0011
Fe2      .5     .5    .25 .06  .0139  .0139   .079  .0107      0      0
Al2      .5     .5    .25 .94  .0139  .0139   .079  .0107      0      0
O1    .1204  .4061      0       .026   .023  .0081   .012      0      0
O2    .2159  .2851  .1313      .0260   .034  .0236  .0232 -.0004 -.0018
O3    .1375  .4909 .17918      .0160  .0184  .0122  .0105 -.0020 -.0041