metamorphic rock

Noun
  1. Rock altered by pressure and heat (synset 114722859)
    is a type of: rock, stone - material consisting of the aggregate of minerals like those making up the Earth's crust
    subtypes:
    • amphibolite - a metamorphic rock composed chiefly of amphibole and plagioclase
    • marlite, marlstone - metamorphic rock with approximately the same composition as marl
    • hornfels, hornstone - a fine-grained metamorphic rock formed by the action of heat on clay rocks
    • gneiss - a laminated metamorphic rock similar to granite
    • schist - any metamorphic rock that can be split into thin layers

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