Intrusive Rocks

By: Alex Batrez


Intrusive rocks are rocks that are cooled underneath the earth's crust. There are three main color differences in intrusive rocks, these color differences are high silica, medium silica, and low silica. High silica is a very "felsic" type of rock and contain a lot of crystals in the rock and they are very light in color.

Medium Silica

Medium silica rocks cool quicker and they cool closer to the earth's surface and contains more darker minerals.

Low Silica

Low silica rocks are usually rich in iron and magnesium and are consider mafic which means they are very dark colored minerals and have crystals that cant be seen.