Citation: Brigatti, M. F.; Frigieri, P.; Ghezzo c; Poppi, L. (2000). Crystal chemistry of Al-rich biotites coexisting with muscovites in peraluminous granites Sample: C6c. American Mineralogist, 85, pp. 436-448.
Formula: Al1.24 Fe1.4 H1.64 K0.98 Mg0.71 Na0.02 O12 Si1.36 Ti0.16
List type: interleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al8 Fe6 Mg6 O28 Si4 Ti4 (Al4 Fe3 Mg3 O14 Si2 Ti2)
Multiplicity: 1