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A process of rock alteration or mineral formation brought about by the action of gases emitted from solidifying magma.
pneu′ma·to·lyt′ic (-tə-lĭt′ĭk) adj.
(Geological Science) a type of metamorphism in which hot gases from solidifying magma react with surrounding rock
the process by which ores and minerals are formed from the action of vapors produced by igneous magmas. — pneumatolytic, adj.See also: Geology