In the previous issue (American Mineralogist, v. 73, p. 936-938) I described a hypothetical planet Alsioff whose crusts and atmosphere contain only Al, Si, O, and F. A series of ten problems were then posed about possible metamorphic and metasomatic phase equilibria on such a planet. An internally consistent set of qualitatively derived answers is given below. Note that a strict thermodynamic analysis would yield different answers (which would be inconsistent with the problems). Some of these inconsistencies are indicated in the answers.

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