Mica
Hazen R M, Finger L W, Velde D
American Mineralogist 66 (1981) 586-591
Crystal structure of a silica- and alkali-rich trioctahedral mica
_database_code_amcsd 0000836
5.329 9.230 10.219 90 100 90 C2/m
atom     x     y     z  occ B(1,1) B(2,2) B(3,3)  B(1,2) B(1,3)  B(2,3)
Si   .5749 .1667 .2255 .828 0.0082 0.0022 0.0023       0 0.0007       0
Fe   .5749 .1667 .2255 .172 0.0082 0.0022 0.0023       0 0.0007 -.00010
Mg1      0    .5    .5 .888 0.0063 0.0012 0.0026       0 0.0008       0
Li1      0    .5    .5 .075 0.0063 0.0012 0.0026       0 0.0008       0
Na1      0    .5    .5 .037 0.0063 0.0012 0.0026       0 0.0008       0
Mg2      0 .8337    .5 .888 0.0061 0.0019 0.0025       0 0.0007       0
Li2      0 .8337    .5 .075 0.0061 0.0019 0.0025       0 0.0007       0
Na2      0 .8337    .5 .037 0.0061 0.0019 0.0025       0 0.0007       0
K        0     0     0      0.0227 0.0068 0.0057       0 0.0016       0
O1   .8198 .2355 .1672      0.0236 0.0097 0.0042 -.00360 0.0012 -.00030
O2   .5264     0 .1669      0.0347 0.0066 0.0041       0 0.0011       0
O3   .6298 .1670 .3901      0.0096 0.0026 0.0027 -.00010 0.0006       0
F    .1336     0 .3992      0.0113 0.0035 0.0027       0 0.0007       0