Phlogopite
Hendricks S B, Jefferson M E
American Mineralogist 24 (1939) 729-771
Polymorphism of the micas with optical measurements
Note: Biotite group
_database_code_amcsd 0000024
5.32 9.21 10.16 90 100.03 90 Cm
atom   x   y   z occ
K    .45 .50 .84
Mg1  .44 .33 .34
Mg2  .44 .00 .34
Si1  .02 .33 .06 .75
Si2  .37 .17 .62 .75
Al1  .02 .33 .06 .25
Al2  .37 .17 .62 .25
O1   .25 .25 .00
O2   .08 .33 .22
O3   .32 .17 .46
O4   .14 .25 .68
O5   .00 .50 .00
O6   .39 .00 .68
OH1  .08 .00 .22 .50
OH2  .32 .50 .46 .50
F1   .08 .00 .22 .50
F2   .32 .50 .46 .50