It is an igneous plutonic rock, 60-65% composed of feldspar (silicate class) and 25-35% quartz. It is quartz that forms irregular isometric grains in the stone that are fused with feldspar grains. There is also a small amount of mica (biotite or muscovite) in granite. The chemical composition of the mineral is characterized by a high content of alkalis and a small percentage of iron and magnesium. The color of granite varies from white and pink to almost red, and depends on the proportions of minerals in the composition. For example, if a stone contains a large amount of potassium feldspar, the stone will have a pink tint, if iron oxide is present, the material will take on a deep red color.
