Citation: Bohlen, S. R.; Peacor, D. R.; Essene, E. J. (1980). Crystal chemistry of a metamorphic biotite and its significance in water barometry from Au Sable Forks, New York. American Mineralogist, 65, pp. 55-62.
Formula: Al1.208 Fe1.392 K Mg1.161 O12 Si2.792 Ti0.276