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

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