contact metamorphism

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Metamorphism in which the mineralogy and texture of a body of rock are changed by exposure to the pressure and extreme temperature associated with a body of intruding magma. Contact metamorphism often results in the formation of valuable minerals, such as garnet and emery, through the interaction of the hot magma with adjacent rock.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun geology Change to rock in physical contact with molten lava