Granite, the most common igneous rock in the continental crust, is composed primarily of feldspar, quartz and mica. It is accurate to speak of “granites”, because many varieties of the stone exist. While they differ in color, texture and crystalline structure, granites have the same essential minerals in common. These minerals occur in different proportions, giving each granite its own color, texture and structural characteristics. There is practically no end to color selections for granite.