Biotite
Brigatti M F, Davoli P
American Mineralogist 75 (1990) 305-313
Crystal-structure refinement of 1M plutonic biotites
sample M32 from a syenite in the Valle del Cervo pluton
_database_code_amcsd 0001295
5.346 9.252 10.238 90 100.02 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)
Fe1      0     0    .5     0.0104 0.0022 0.0022      0 0.0016      0
Mg2      0 .3340    .5     0.0056 0.0027 0.0028      0 0.0004      0
K        0    .5     0     0.0222 0.0084 0.0068      0 0.0020      0
Al   .0752 .1674 .2262 .25 0.0074 0.0022 0.0023  .0007 0.0005  .0002
Si   .0752 .1674 .2262 .75 0.0074 0.0022 0.0023  .0007 0.0005  .0002
O1   .0236     0 .1681     0.0173 0.0048 0.0029      0 -.0003      0
O2   .3221 .2339 .1695     0.0153 0.0061 0.0032 -.0011 0.0013  .0000
O3   .1308 .1673 .3910     0.0128 0.0033 0.0027  .0012 0.0004 -.0007
O4   .1293    .5 .3960     0.0130 0.0040 0.0035      0 0.0029      0
H     .010    .5  .315