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Gneiss which is formed frm the metamorphism of ignous rock is known as orthogneiss and gneiss which is formed from the metamorphism of sedimentary rocks is known as paragneiss.

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Gneiss which is formed frm the metamorphism of ignous rock is known as orthogneiss and gneiss which is formed from the metamorphism of sedimentary rocks is known as paragneiss.

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Smoky quartz is usually found in intrusive igneous and certain high grade metamorphic rocks, like granite and orthogneiss.

Orthogneiss designates a gneiss derived from an igneous rock, and prognosis is one from a sedimentary rock.

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A gneiss is a metamorphic rock. Metamorphic rocks are created by the alteration of rocks by heat and pressure. Therefore, a gneiss may be created from an igneous rock in which case it would be called an orthogneiss.

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Gneiss is a high grade metamorphic rock, the product of various rock types being exposed to intense pressures and heat under the surface of the Earth. Orthogneiss is a gneiss whose parent rock was igneous, and paragneiss is a gneiss whose parent rock was sedimentary.

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