Brannockite
Armbruster T, Oberhansli R
American Mineralogist 73 (1988) 595-600
Crystal chemistry of double-ring silicates: Structures of sugilite and
brannockite
Sample: small domain
_database_code_amcsd 0001159
10.002 10.002 14.263 90 90 120 P6/mcc
atom     x     y     z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
K        0     0   .25   .017   .017   .021  .0085      0      0
Sn     1/3   2/3   .25  .0039  .0039  .0090 .00195      0      0
Li      .5    .5   .25   .014   .014   .015   .007      0      0
Si   .2384 .3564 .3905  .0033  .0036  .0058  .0017  .0006  .0007
O1   .1313 .3971     0   .020   .020   .008   .008      0      0
O2   .2234 .2800 .1351   .007   .011   .016   .007  .0000  -.001
O3   .1592 .5040 .1733   .005   .005   .008   .001  -.001  -.002