The rock is an igneous rock as it is made from grains which are visible to the naked eye and also has crystals.

Rock Formation Details

The rock is formed when magma is cooled. The earth’s crust contains heated materials which are in a molten state. When these materials cool they form rock either on the surface of the earth or underneath. The rocks found on the surface of the earth are referred to as extrusive igneous rock while those underneath are called intrusive igneous rocks. The molten materials in the crust of the earth are caused by extreme temperatures of up to 1200 degrees Celsius and very high pressure (Blundy & Annen, 2016). The temperature and pressure changes sometimes cause the magma to shoot up in a volcanic eruption and as it cools down to forms igneous rocks on the earth’s surface.

Alternatively, the magma may slowly cool underneath the earth’s surface and lead to the formation of intrusive igneous rocks. Because of the extreme temperatures and pressure changes associated with the formation of these rocks, the igneous rocks do not contain fossils or organic matter.

Minerals and Texture

Major minerals found in granite which the most abundant igneous rock on the surface of the earth is quartz and feldspar. Granite has a grained texture which feels coursed. The formed crystals also form projections, and it may also have cavities.

Fun Facts

Huge Igneous rocks at the core of mountains are referred to as Batholiths. The earth’s crust is mainly made up of igneous rock which constitutes a 95% of the rock body. Over the years, the total number of igneous rocks that have been identified as the amount to 700.

Reference

Blundy, J. D., & Annen, C. J. (2016). Crustal magmatic systems from the perspective of heat transfer. Elements, 12(2), 115-120.