metamorphic rock

Types:

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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

Type of:

rock, stone

material consisting of the aggregate of minerals like those making up the Earth's crust