Granite is a type of intrusive igneous rock comprised primarily of quartz and feldspar. When magma cools and hardens below the Earth's surface, the resulting rock is called an intrusive igneous. When this phenomenon happens on the Earth's surface, the rock is classified as extrusive igneous.
Usually gray or pinkish in color with a medium or coarse texture, granite is one of the most common rocks in the Earth's crust. It can be found in masses of up to hundreds of square miles in area in some places. Granite's hardness makes it useful in construction, and many quarries are scattered throughout Europe, Southern Africa, Brazil and India. There is some evidence that not all granite, however, is igneous rock, but that some is actually metamorphic.