Citation: Bigi, S.; Brigatti, M. F. (1994). Crystal chemistry and microstructures of plutonic biotite Sample 1M from Valle del Cervo syenitic complex. American Mineralogist, 79, pp. 63-72.
Formula: Al1.207 Fe0.4 K1.906 Mg0.512 Mn0.007 Na0.034 O12 Si2.808 Ti0.067
List type: noninterleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al10 Fe2 K4 Mg2 Mn2 Na4 O24 Si8 Ti2 (Al5 Fe K2 Mg Mn Na2 O12 Si4 Ti)
Multiplicity: 1