Citation: Brigatti, M. F.; Frigieri, P.; Ghezzo c; Poppi, L. (2000). Crystal chemistry of Al-rich biotites coexisting with muscovites in peraluminous granites Sample: B1. American Mineralogist, 85, pp. 436-448.
Formula: Al1.9 Fe1.44 H1.54 K0.95 Mg0.84 Na0.05 O12 Si2.64 Ti0.16
List type: noninterleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al12 Fe6 Mg6 O28 Si8 Ti4 (Al6 Fe3 Mg3 O14 Si4 Ti2)
Multiplicity: 1