What Are Some Facts About Igneous Rocks?

Some facts about igneous rocks include that they are glassy in nature, that pumice igneous rock is the lightest type of rock on Earth, and that the moon is made of igneous rocks. Igneous rocks come from molten magma and have two main versions: basalt and pumice.

Igneous rocks are further divided into two versions: extrusive and intrusive igneous rocks. Extrusive igneous rocks form when magma rises to the earth’s surface and hardens. They are glassy in nature due to the rapid formation process. Pumice is a type of extrusive igneous rock used to manufacture different products such as cement, toothpaste and some cosmetic products. Basalt is mostly used to construct statues and buildings.

Intrusive igneous rocks form when magma cools and hardens below the surface of the Earth. They have a grainy texture because their formation process is slower compared to extrusive igneous rocks. Some examples of intrusive igneous rocks include gabbro and granite.

Gabbro has high deposits of silver, chromium and gold. Granite is used in the manufacture of gravestones, countertops and statues because of its durability and stability. There are more than 700 different types of igneous rocks identified as of 2015. The word “Igneous” derives from the Latin phrase meaning “made from fire.”