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: Japan-Shimizu
_database_code_amcsd 0001153
10.145 10.145 14.289 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 .74  .0307  .0307   .034 .01535      0      0
FeA     1/3   2/3    .25 .56  .0072  .0072  .0099  .0036      0      0
MgA     1/3   2/3    .25 .44  .0072  .0072  .0099  .0036      0      0
Si1  .24750 .3507  .3919 .87  .0088  .0105  .0068  .0055  .0013  .0013
Al1  .24750 .3507  .3919 .13  .0088  .0105  .0068  .0055  .0013  .0013
Fe2      .5    .5    .25 .06  .0102  .0102  .0063  .0073      0      0
Al2      .5    .5    .25 .94  .0102  .0102  .0063  .0073      0      0
O1    .1198 .4044      0      .0278  .0214  .0086  .0118      0      0
O2    .2145 .2833 .13159      .0261  .0336  .0228  .0233 -.0011 -.0036
O3    .1373 .4904 .17887      .0164  .0176  .0120  .0106 -.0028 -.0049