the process by which rocks are altered or minerals and ores are formed by the action of vapors given off by magma.
Origin of pneumatolysis
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a type of metamorphism in which hot gases from solidifying magma react with surrounding rock
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012