Citation: Brigatti, M. F.; Galli, E.; Poppi, L. (1991). Effect of Ti substitution in biotite-M crystal chemistry Sample 16 from a monzonite-alkali syenite, Sande caldron, Norway. American Mineralogist, 76, pp. 1174-1183.
Formula: Al1.249 Ca0.009 Cr0.006 Fe1.239 K0.968 Mg1.401 Mn0.024 Na0.02 O12 Si2.832 Ti0.231
List type: noninterleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al14 Cr6 Fe6 Mg6 Mn6 O24 Si8 Ti6 (Al7 Cr3 Fe3 Mg3 Mn3 O12 Si4 Ti3)
Multiplicity: 1