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Pneumatolysis is an obsolete geologic term for magma emitting gasses that alter surrounding rock or crystallize minerals.^[1] Pneumatolysis is now considered a type ofhydrothermal interaction.

• Metasomatism

• Philip Lake andR. H. Rastall.A textbook of geology (1920). 3rd ed. Edward Arnold: London.[1] pp. 251-255 describes pneumatolysis, especially in granites.
• McGraw-Hill Encyclopedia of the Geological Sciences. Second edition. New York: McGraw-Hill, 1987. p. 518

• Chisholm, Hugh, ed. (1911)."Pneumatolysis" .Encyclopædia Britannica. Vol. 21 (11th ed.). Cambridge University Press. pp. 868–869.

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