AM_Biotite_18 Formula: Si2.832 Al1.249 K.968 Ca.009 Na.02 Mg1.401 Cr.006 Fe1.239 Mn.024 Ti.231 O12 Name: Biotite Unit cell: 5.333 9.256 10.186 90.0 100.17 90.0 , V=494.90 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 16 from a monzonite-alkali syenite, Sande caldron, Norway