Biotite
Hendricks S B, Jefferson M E
American Mineralogist 24 (1939) 729-771
Polymorphism of the micas with optical measurements
_database_code_amcsd 0000028
5.3 5.3 60.0 90 90 120 P-1
atom     x     y     z occ
K1       0 .1667 .0825
K2   .3333 .1667 .2492
K3   .3333    .5 .4158
Mg1  .3333 .1667     0
Mg2      0    .5     0
Mg3  .3333 .1667    .5
Mg4      0    .5    .5
Mg5      0 .8333 .1667
Mg6  .6667 .1667 .1667
Mg7  .3333    .5 .1837
Mg8      0 .1667    .5
Mg9  .3333 .8333 .3333
Mg10 .6667    .5 .3503
Si1  .3333 .8333 .0440 .75
Si2  .6667    .5 .0440 .75
Si3      0 .1667 .5440 .75
Si4  .3333 .8333 .5440 .75
Si5  .6667 .8333 .2107 .75
Si6      0    .5 .2107 .75
Si7  .6667    .5 .1227 .75
Si8  .3333 .8333 .1227 .75
Si9      0 .8333 .3773 .75
Si10 .6667 .1667 .3773 .75
Si11     0    .5 .2893 .75
Si12 .6667 .8333 .2893 .75
Al1  .3333 .8333 .0440 .25
Al2  .6667    .5 .0440 .25
Al3      0 .1667 .5440 .25
Al4  .3333 .8333 .5440 .25
Al5  .6667 .8333 .2107 .25
Al6      0    .5 .2107 .25
Al7  .6667    .5 .1227 .25
Al8  .3333 .8333 .1227 .25
Al9      0 .8333 .3773 .25
Al10 .6667 .1667 .3773 .25
Al11     0    .5 .2893 .25
Al12 .6667 .8333 .2893 .25
O1   .3333 .8333 .0170
O2   .6667    .5 .0170
O3       0 .6667 .0530
O4      .5 .6667 .0530
O5      .5 .1667 .0530
O6       0 .1667 .5170
O7   .3333 .8333 .5170
O8   .1667     0 .5530
O9   .6667     0 .5530
O10  .1667    .5 .5530
O11  .6667 .8333 .1837
O12      0    .5 .1837
O13  .6667    .5 .1497
O14  .3333 .8333 .1497
O15  .8333 .6667 .2197
O16  .8333 .1667 .2197
O17  .3333 .6667 .2197
O18      0 .6667 .1137
O19     .5 .6667 .1137
O20     .5 .1667 .1137
O21      0 .8333 .3503
O22  .6667 .1667 .3503
O23      0    .5 .3163
O24  .6667 .8333 .3163
O25  .8333     0 .3863
O26  .3333     0 .3863
O27  .8333    .5 .3863
O28  .8333 .1667 .2803
O29  .8333 .6667 .2803
O30  .3333 .6667 .2803
OH1      0 .1667 .0170 .50
OH2  .6667    .5 .5170 .50
OH3  .3333 .1667 .1837 .50
OH4      0 .1667 .1497 .50
OH5  .3333    .5 .3503 .50
OH6  .3333 .1667 .3163 .50
F1       0 .1667 .0170 .50
F2   .6667    .5 .5170 .50
F3   .3333 .1667 .1837 .50
F4       0 .1667 .1497 .50
F5   .3333    .5 .3503 .50
F6   .3333 .1667 .3163 .50