Biotite
Brigatti M F, Davoli P
American Mineralogist 75 (1990) 305-313
Crystal-structure refinement of 1M plutonic biotites
sample M73 from a monzonite in the Valle del Cervo pluton
_database_code_amcsd 0001297
5.345 9.258 10.222 90 100.23 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     0.0076 0.0020 0.0033      0 0.0016      0
Mg2      0 .3347    .5     0.0061 0.0032 0.0030      0 0.0007      0
K        0    .5     0     0.0255 0.0080 0.0080      0 0.0024      0
Al   .0748 .1669 .2257 .25 0.0058 0.0018 0.0025 -.0001 0.0007 -.0001
Si   .0748 .1669 .2257 .75 0.0058 0.0018 0.0025 -.0001 0.0007 -.0001
O1   .0267     0 .1687     0.0224 0.0035 0.0033      0 0.0001      0
O2   .3195 .2361 .1681     0.0141 0.0060 0.0034 -.0028 0.0017 -.0007
O3   .1316 .1677 .3909     0.0086 0.0030 0.0027  .0003 0.0009 -.0003
O4   .1291    .5 .3947     0.0076 0.0022 0.0047      0 0.0016      0
H      .09    .5  .315