Metamorphic rocks are those that form by the effects of heat, pressure and shear upon igneous and sedimentary rocks. Some form during mountain-building by forces of regional metamorphism, others from the heat of igneous intrusions in contact metamorphism. A third category forms by the mechanical forces of fault movements: cataclasis and mylonitization.
This is just a starting point to explore the variety in metamorphic rocks.
Learn more:
Introducing Igneous Rocks
Introducing Sedimentary Rocks
Introducing Metamorphic Rocks
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 Amphibolite |  Blueschist |  Cataclasite |  Eclogite |
 Gneiss |  Greenschist |  Greenstone |  Hornfels |
 Marble |  Migmatite |  Mylonite |  Phyllite |
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