Is Granite An Intrusive Or Extrusive Rock

Igneous rocks are classified into two groups depending upon where the molten rock solidifies.

Is granite an intrusive or extrusive rock.

Granite has a lot of different colors ranging from white to pink. Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite. 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.

However if the bubbles are tiny it s called pumice. Extrusive igneous rocks erupt onto the surface where they cool quickly to form small crystals. See sierra nevada batholith. The foidolite rock is a special case in the rock family.

Derived from the words feldspar and silica to describe an igneous rock having abundant light colored minerals such as quartz feldspars or muscovite. The central cores of major mountain ranges consist of intrusive igneous rocks usually granite. Rocks that display large granular crystal structure are called pegmatitic. By contrast intrusive rocks are formed from magma that was forced into older rocks at depth within earth s crust.

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

Intrusive rock forms within earth s crust from the crystallization of magma. Many mountain ranges such as the sierra nevada in california are formed mostly from large granite or related rock intrusions. If the bubbles are minimal the rock is called obsidian. The other is extrusive rock that is a volcanic eruption or similar event.

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. It is the intrusive equivalent to the extrusive foidite. Some cool so. There was enough potassium calcium and sodium available in the magma to form feldspars 60 but foidolites are free of silica.

Before discussing further differences between both rocks let us see what is a rock and what are intrusive rocks and extrusive rocks. Intrusions are one of the two ways igneous rock can form. 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. Granite is a coarse grained light colored intrusive igneous rock that contains mainly quartz feldspar and mica minerals.