[noo-muh-tol-uh-sis, nyoo-] /ˌnu məˈtɒl ə sɪs, ˌnyu-/

noun, Geology.
the process by which rocks are altered or minerals and ores are formed by the action of vapors given off by magma.
a type of metamorphism in which hot gases from solidifying magma react with surrounding rock


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