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: Eifel-Nickenich
_database_code_amcsd 0001152
10.078 10.078 14.319 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   .033   .015      0      0
FeA     1/3    2/3    .25 .01  .0053  .0053  .0098 .00265      0      0
MgA     1/3    2/3    .25 .99  .0053  .0053  .0098 .00265      0      0
Si1  .24734 .35333 .39204 .85  .0094  .0107  .0080  .0060  .0016  .0017
Al1  .24734 .35333 .39204 .15  .0094  .0107  .0080  .0060  .0016  .0017
Fe2      .5     .5    .25 .08  .0163  .0163  .0091  .0137      0      0
Al2      .5     .5    .25 .92  .0163  .0163  .0091  .0137      0      0
O1    .1237  .4071      0       .027   .022  .0079   .012      0      0
O2    .2176  .2851  .1318       .027   .033  .0245  .0238 -.0001 -.0025
O3   .1410   .4937  .1787      .0153  .0169  .0120  .0102 -.0036 -.0048