A medium to coarse and widely occurring type of intrusive, felsic, igneous rock. Rich in quartz and potassium feldspar, granite occasionally contains individual crystals larger than the groundmass. Granites can be pink, dark gray or black and depends on the chemistry and mineralogy. This type of rock is common throughout the world, but certain areas are well known for producing commercial granite. Granite is used as flooring tiles in buildings and monuments, and as countertops in residential homes.