Citation: Bohlen, S.R.; Peacor, D.R.; Essene, E.J. (1980). Crystal chemistry of a metamorphic Biotite and its significance in water barometry. American Mineralogist, 65, pp. 55-62.
Formula: Al2.413 Fe2.786 H4 K2 Mg2.321 O24 Si5.587 Ti0.55
Chemical name: K2 (Fe2.786 Mg2.321 Ti0.550) (Al2.413 Si5.587 O20) (O H)4
List type: interleaving
List: 2D
Basis: (1;0;0 0;1;0)
Dimensionality: 2
Formula: Al8 Fe6 Mg6 O24 Si8 Ti6 (Al4 Fe3 Mg3 O12 Si4 Ti3)
Multiplicity: 1