Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were orig

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Gneiss is a common and widely distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks. They are often foliated with lighter and darker bands that may be folded or faulted.

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Keywords: bands, common, faulted, folded, gneiss, high-grade, igneous, metamorphism, rock, sediment, sedimentary