AM_Biotite_16 Formula: Si2.904 Al1.135 (K.947 Ca.002 Na.051) Mg2.088 Cr.054 Fe.498 Mn.018 Ti.267 O12 Name: Biotite Unit cell: 5.314 9.19 10.16 90.0 100.18 90.0 , V=488.36 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 12 from a lamproite rock, Jummilla, Spain