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 0000026
5.3 5.3 30.0 90 90 120 P3_112
atom    x     y    z occ
K     1/9 .0556    0
Mg1   1/9   2/9  1/6
Mg3  -2/9  -4/9  1/6
Mg3   4/9   8/9  1/6
Si1  -.22   .22 .078 .75
Si2   .44  -.44 .078 .75
Al1  -.22   .22 .078 .25
Al2   .44  -.44 .078 .25
O1    .11   .39  .06
O2   -.39  -.11  .06
O3   -.39   .39  .06
O4   -.22   .22  .13
O5    .44  -.44  .13
OH    .11  -.11  .13 .50
F     .11  -.11  .13 .50