Intrusive Granite Rock Definition

Pegmatite is an igneous rock composed almost entirely of crystals that are over one centimeter in diameter.

Intrusive granite rock definition.

The molten material then slowly solidifies below earth s surface where it may later be exposed through erosion. Intrusive rocks also called plutonic rocks cool slowly without ever reaching the surface. Intrusions are one of the two ways igneous rock can form. Magma rises bringing minerals and precious metals such as gold silver molybdenum and lead with it forcing its way into older rocks it cools slowly tens of thousands of years or longer underneath earth s crust which allows the individual crystals to grow large by coalescing like with like.

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. Is granite an intrusive or extrusive rock. Strictly speaking granite is an. Plutonic rocks are igneous rocks that solidified from a melt at great depth.

Granite is the most common intrusive igneous rock as the continental crust is composed of granite. See sierra nevada batholith. In geology a pluton is a body of intrusive igneous rock also called plutonic rock that is crystallized from magma slowly cooling below the surface of the earth although pluton is a general term to describe an intrusive igneous body there has been some confusion around the world as to the definition of a pluton. It forms from the slow crystallization of magma below earth s surface.

Many mountain ranges such as the sierra nevada in california are formed mostly from large granite or related rock intrusions. Granite ˈ ɡ r æ n ɪ t is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture. They have large crystals that are usually visible without a microscope. Specimen is about 4 5 x 3 5 x 3 5 centimeters.

Granite has a lot of different colors ranging from white to pink. This surface is known as a phaneritic texture. Intrusive rock forms within earth s crust from the crystallization of magma. For instance if an extrusive rock comes out as glass with large bubbles it s called scoria.

The specimen shown here is about two inches five centimeters across. Pluton has been used to describe any non tabular intrusive body and batholith. However if the bubbles are tiny it s called pumice. Thus plutonic rock.

Granite has mineral crystals that can be seen clearly with the naked eye. If the bubbles are minimal the rock is called obsidian. Granites can be predominantly white pink or gray in color depending on their mineralogy the word granite comes from the latin granum a grain in reference to the coarse grained structure of such a completely crystalline rock. Granite is a light colored igneous rock with grains large enough to be visible with the unaided eye.

By contrast intrusive rocks are formed from magma that was forced into older rocks at depth within earth s crust. Perhaps the best known phaneritic rock is granite.