Igneous Rocks Like Granite Can Become Gneiss

It forms from the slow crystallization of magma below earth s surface.

Igneous rocks like granite can become gneiss.

Granite gneiss can also form through the metamorphism of sedimentary rocks. The parent rock can be either sedimentary igneous or even another metamorphic rock. Gneiss is a metamorphic rock granite is an igneous rock and sandstone is a sedimentary rock. Heat and pressure cause granite to become gneiss and change sandstone into quartzite.

Paragneiss is gneiss derived from sedimentary rock such as sandstone. A photograph of polished gneiss from the stock of a countertop vendor. The mineral constituents that create these rocks get recycled over time. If the chemistry and conditions are right granite forming minerals can precipitate.

The mineral composition of both granite and gneiss is same but alteration of granite because of very high pressure and temperature leads to the formation of gneiss. Granite is a light colored igneous rock with grains large enough to be visible with the unaided eye. Gneiss ˈ n aɪ s is a common and widely distributed type of metamorphic rock gneiss is formed by high temperature and high pressure metamorphic processes acting on formations composed of igneous or sedimentary rocks orthogneiss is gneiss derived from igneous rock such as granite. Granite is composed mainly of quartz and feldspar with minor amounts of mica amphiboles and other minerals this mineral composition usually gives granite a red pink gray or white color with dark mineral.

Granite is an igneous rock whereas gneiss is formed after metamorphosis of an existing igneous rock. If this occurs it will now be classified as a granite. Gneiss can turn into an igneous rock if it is melted. The end product of their metamorphism is a banded rock with a mineralogical composition like granite.

More fleshed out fuller and still correct answer. Metamorphic rocks form from heat and pressure which changes the original or parent rock into a completely new rock.