Metamorphic Rocks

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Images of Metamorphic Rocks

Metamorphic rocks form in the earth's interior as previously existing rocks are altered by heat, pressure, chemically active fluids. They are composed of wide variety of minerals. Pressure during metamorphism may produce a prominent lineation or layering in the rock called foliation. At the simplest level, the metamorphic rocks are classified on the basis of whether they are foliated or nonfoliated.

Images of foliated metamorphic rocks

Slate from Bangor, Pennsylvania	Phyllite from Ely, Vermont. Note the sheen that distinguishes it from slate

Images of nonfoliated metamorphic rocks

Marble from Tate, Georgia	Quartzite from Baraboo, Wisconsin	Serpentine from Angels Camp, California

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