Examples of igneous rocks include basalt,granite,pumice,obsidian,tuff,diorite,gabbro,and calsite. Igneous rock is formed when magma cools and solidifies,it may do this above or below earths surface.magma can be forced into rocks,blown out in volcanic explosions or forced to the surface as lava.There are over 700 types of igneous rocks.Basalt forms the metamorphic rock granilute when subjected to extreme pressure over time.The upper section of earths crust is made up around 95% of igneous rock.