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: Sardinia
_database_code_amcsd 0001155
10.127 10.127 14.288 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 .75   .032   .032   .035   .016      0      0
FeA     1/3    2/3    .25 .41  .0068  .0068  .0090  .0034      0      0
MgA     1/3    2/3    .25 .59  .0068  .0068  .0090  .0034      0      0
Si1  .24725 .35136 .39189 .86  .0093  .0115  .0068  .0060  .0014  .0015
Al1  .24725 .35136 .39189 .14  .0093  .0115  .0068  .0060  .0014  .0015
Fe2      .5     .5    .25 .06  .0116  .0116  .0061  .0089      0      0
Al2      .5     .5    .25 .94  .0116  .0116  .0061  .0089      0      0
O1    .1207  .4049      0       .027   .021   .007   .010      0      0
O2    .2152  .2833  .1316       .027   .035  .0223   .024 -.0015 -.0035
O3    .1383  .4913  .1787      .0163  .0177  .0124  .0102 -.0034 -.0054