AM_Biotite_17 Formula: Si2.736 Al1.27 K.915 Ca.007 Na.015 Mg1.476 Cr.006 Fe.942 Mn.024 Ti.39 O12 Name: Biotite Unit cell: 5.329 9.235 10.19 90.0 100.2 90.0 , V=493.56 Space group: C12/M1 (12)

Brigatti M F , Galli E , Poppi L , American Mineralogist , 76 (1991) p.1174-1183, Effect of Ti substitution in biotite-M crystal chemistry, Sample 15 from a alkaline gabbro-peralkaline syenite rock, Mt St Hilaire, Quebec