Is Granite An Intrusive Or Extrusive Rock

The foidolite rock is a special case in the rock family.

Is granite an intrusive or extrusive rock.

By contrast intrusive rocks are formed from magma that was forced into older rocks at depth within earth s crust. It is a rare coarse grained intrusive igneous rock. If the bubbles are minimal the rock is called obsidian. Derived from the words feldspar and silica to describe an igneous rock having abundant light colored minerals such as quartz feldspars or muscovite.

Intrusive igneous rocks crystallize below earth s surface and the slow cooling that occurs there allows large crystals to form. See sierra nevada batholith. Granite the equivalent of its extrusive volcanic rock type rhyolite is a very common type of intrusive igneous rock. Is granite an intrusive or extrusive rock.

Granite is an intrusive rock while rhyolite is an extrusive rock intrusive rocks are rocks that are formed below the earth s surface extrusive rocks are rocks that are formed on the earth s. Granite has a lot of different colors ranging from white to pink. The molten material then slowly solidifies below earth s surface where it may later be exposed through erosion. For instance if an extrusive rock comes out as glass with large bubbles it s called scoria.

Intrusive vs extrusive rocks the key difference between intrusive and extrusive rocks is that the intrusive rocks are formed from magma whereas the extrusive rocks are formed from lava. Key terms felsic. Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite. Pegmatite is an intrusive igneous rock made up of large interlocking crystals the word pegmatite comes from the greek word pegnymi which means to bind together referring to the entwined feldspar and quartz crystals commonly found in the rock.

Intrusive rock forms within earth s crust from the crystallization of magma. Before discussing further differences between both rocks let us see what is a rock and what are intrusive rocks and extrusive rocks. The central cores of major mountain ranges consist of intrusive igneous rocks usually granite. Some cool so.

Extrusive rock any rock derived from magma molten silicate material that was poured out or ejected at earth s surface. However if the bubbles are tiny it s called pumice. Intrusions are one of the two ways igneous rock can form. The other is extrusive rock that is a volcanic eruption or similar event.

Igneous rocks are classified into two groups depending upon where the molten rock solidifies. It is the intrusive equivalent to the extrusive foidite. Rocks that display large granular crystal structure are called pegmatitic. There was enough potassium calcium and sodium available in the magma to form feldspars 60 but foidolites are free of silica.