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.
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.