AM_Biotite
Formula:
K Mg3 (Si3 Al) O11 (F H)
Name:
Biotite
Unit cell:
5.3 5.3 60.0 90.0 90.0 120.0 , V=1459.60
Space group:
P11-1 (1)
Hendricks S B , Jefferson M E , American Mineralogist , 24 (1939) p.729-771, Polymorphism of the micas with optical measurements