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: Norway
_database_code_amcsd 0001150
10.104 10.104 14.306 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 .90   .029   .029   .031  .0145      0      0
FeA    1/3   2/3   .25 .16   .007   .007   .009  .0035      0      0
MgA    1/3   2/3   .25 .84   .007   .007   .009  .0035      0      0
Si1  .2501 .3554 .3921 .86  .0084  .0100  .0058  .0046  .0010  .0010
Al1  .2501 .3554 .3921 .14  .0084  .0100  .0058  .0046  .0010  .0010
Fe2     .5    .5   .25 .03  .0091  .0091  .0068  .0072      0      0
Al2     .5    .5   .25 .97  .0091  .0091  .0068  .0072      0      0
O1   .1238 .4090     0       .025   .017   .009   .004      0      0
O2   .2196 .2911 .1327       .029   .043   .021   .030  -.005  -.004
O3   .1383 .4936 .1789       .016   .016   .012   .010  -.003  -.005