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metamorphic rock

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.17 sec.

metamorphic rock

Any of a class of rocks that result from the alteration of preexisting rocks in response to changing geological conditions, including variations in temperature, pressure, and mechanical stress. The preexisting rocks may be igneous, sedimentary, or other metamorphic rocks. The structure and mineralogy reflect the particular type of metamorphism that produced the rock and the composition of the parent rock. Metamorphic rocks are commonly classified by type of facies, predictable mineral assemblages associated with certain temperature and pressure conditions (see, e.g., granulite facies).
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The Taj Mahal's gleaming, white surface is made from marble, a metamorphic rock formed when heat and pressure underground cause minerals to crystallize.
World's wonders, worn down? Only one of the original Seven Wonders ... by Crane, Cody / Science World
The Bronx, Manhattan and parts of Brooklyn, Queens and Staten Island lie in a region of the New England Uplands locally known as the Manhattan Prong, a northeast trending deeply-eroded sequence of metamorphic rock.
Digging for data can put projects on the fastrack by Tamaro, George J. / Real Estate Weekly
Romer and Rotzler demonstrate the importance of understanding the reaction history of metamorphic rocks for accurate interpretation of U-Pb data in metamorphic titanite.
Geochronology: Linking the Isotopic record with Petrology and Textures by Davis, W.J. / Geoscience Canada
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