Brannockite
Armbruster T, Oberhansli R
American Mineralogist 73 (1988) 595-600
Crystal chemistry of double-ring silicates: Structures of sugilite and
brannockite
_database_code_amcsd 0001158
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  .0157  .0157  .0017 .00785      0      0
Sn      1/3    2/3    .25  .0046  .0046  .0045  .0023      0      0
Li       .5     .5    .25   .019   .019   .008   .015      0      0
Si   .23866 .35649 .39057  .0038  .0041  .0029  .0022  .0006  .0011
O1    .1318  .3977      0   .019   .016   .003   .008      0      0
O2    .2237  .2807  .1342  .0087  .0128  .0134  .0081  .0006  .0004
O3    .1598  .5038  .1726  .0077  .0050  .0072  .0033 -.0013 -.0036