Intrusive rock or plutonic rock is one of the types of igneous rocks. It is made when magma cools down and solidifies underneath Earth’s surface. Some examples of intrusive rocks are gabbro which contains pyroxene and feldspar, granite which is a rock with contains quartz, peridotite which is a rock that contains a small amount of quartz, feldspar, pyroxene or amphibole, pegmatite which contains rare minerals that are not commonly found in other parts of a magma chamber and diorite which contains a mixture of pyroxene, feldspar, hornblende and quartz. The other type of igneous rock is extrusive or volcanic rock which is formed when magma solidifies and cools down on the Earth’s surface – examples are basalt, obsidian, scoria, tuff, andesite and pumice.
