Igneous Rock And Granite

Igneous rocks are formed from the solidification of molten rock material.

Igneous rock and granite.

Learn more about the properties and uses of granite in this article. The main minerals in igneous rocks are hard primary ones. It is the most common plutonic rock of the earth s crust forming by the cooling of magma silicate melt at depth. Granite is an igneous intrusive rock crystallized at depth with felsic composition rich in silica and predominately quartz plus potassium rich feldspar plus sodium rich plagioclase and phaneritic subeuhedral texture minerals are visible to the unaided eye and commonly some of them retain original crystallographic shapes.

Igneous rocks form when magma molten rock cools and crystallizes either at volcanoes on the surface of the earth or while the melted rock is still inside the crust. All magma develops underground in the lower crust or upper mantle because of the intense heat there. The two best known igneous rock types are basalt and granite which have distinctly different compositions and textures. Igneous rocks can have many different compositions depending on the magma they cool from.

What are igneous rocks. Strictly speaking granite is an. Feldspar quartz amphiboles and pyroxenes together called dark minerals by geologists as well as olivine along with the softer mineral mica. It forms from the slow crystallization of magma below earth s surface.

Granite ˈ ɡ r æ n ɪ t is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture. Granite is used by the public as a catchall name for any light colored coarse grained igneous rock. Granite is a light colored igneous rock with grains large enough to be visible with the unaided eye. Granite is a type of igneous rock that consists of quartz gray plagioclase feldspar white and alkali feldspar beige plus dark minerals such as biotite and hornblende.

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. Intrusive igneous rocks crystallize below earth s surface and the slow cooling that occurs there allows large crystals to form. Igneous rock any of various crystalline or glassy rocks formed by the cooling and solidification of molten earth material igneous rocks constitute one of the three principal classes of rocks the others being metamorphic and sedimentary. Examples of intrusive igneous rocks are diabase diorite gabbro granite pegmatite and peridotite.

There are two basic types.