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Economic Geology; October 1969; v. 64; no. 6; p. 599-612
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Some stability relations of alunite

J. J. Hemley, P. B. Hostetler, A. J. Gude, and W. T. Mountjoy

Alunite stability relations were studied experimentally at 200-380 degrees C and 15,000 psi total pressure, and invariant points determined for the system alunite-muscovite-kaolinite-K-feldspar-quartz in terms of total molal H 2 SO 4 and K 2 SO 4 . 'The effect of pressure is small. . . Alunite-kaolinite (including dickite or pyrophyllite) are shown to be the most likely products of. . .alteration processes [at high H 2 SO 4 concentration] in either hot spring or higher temperature environments, whereas muscovite-alunite is favored by higher temperature as well as higher potassium concentrations.'

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