AM_Biotite_24 Formula: Si2.72 Al1.78 Fe1.48 Mg.7 Ti.16 (Na.02 K.98) O11.8 F.16 Cl.04 H1.56 Name: Biotite Unit cell: 5.344 9.256 10.237 90.0 100.27 90.0 , V=498.25 Space group: C12/M1 (12)

Brigatti M F , Frigieri P , Ghezzo c , Poppi L , American Mineralogist , 85 (2000) p.436-448, Crystal chemistry of Al-rich biotites coexisting with muscovites in, peraluminous granites, Sample: H87