AM_Biotite_14 Formula: Si2.932 Al1.161 K.958 Ca.004 Na.016 Mg1.602 Cr.054 Fe.588 Mn.03 Ti.522 O12 Name: Biotite Unit cell: 5.322 9.228 10.102 90.0 100.25 90.0 , V=488.21 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 10 from a lamproite rock, Fortuna, Spain