Mueller’s (1972) proposed for an ideal solution model for biotite stabilities is sound, and his model is correct for biotites with low Fe3+ contents. Wones, Burns, and Carroll (1971) redetermined the stability of the end member, annite, KFe3AlSi3O10(OH)2. New data on Ni-NiO (Huebner and Sato, 1970) and Fe2SiO8-SiO2-Fe3O4 (Wones and Gilbert, 1969) are also available. This led to a correction of the so-called “standard state” on which the biotite solution theory of Wones and Eugster (1965) was based. As a consequence an “ideal” model seems most likely for biotites on the join phlogopite-annite. For the reaction

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