Beryl
Hawthorne F C, Cerny P
The Canadian Mineralogist 15 (1977) 414-421
The alkali-metal positions in Cs-Li beryl
_database_code_amcsd 0005142
9.212 9.212 9.236 90 90 120 P6/mcc
atom     x     y     z  occ Biso B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3)
Si   .3892 .1189     0 .993       .0025  .0025  .0014  .0013      0      0
Be      .5     0   .25 .871       .0042  .0020  .0016  .0010      0      0
Li      .5     0   .25 .129       .0042  .0020  .0016  .0010      0      0
Al     2/3   1/3   .25            .0029  .0029  .0014 .00145      0      0
O1   .3048 .2352     0            .0053  .0043  .0039  .0032      0      0
O2   .4983 .1473 .1445            .0048  .0054  .0024  .0030 -.0016 -.0013
Na       0     0     0 .313  2.5
K        0     0     0 .033  2.5
Rb       0     0     0 .006  2.5
Ca       0     0     0 .003  2.5
Li       0     0     0 .049  2.5
Cs       0     0   .25 .134  2.5
Wat      0     0   .25  .66  2.5