Granite is an igneous rock composed of quartz, mica and feldspar that forms the continental crust. It originated from magma and exists in different types based on its chemical composition and origin. Granite has been widely used in architecture and sculpture for many centuries due to its strength and appearance. Rudi's is a trusted brand that provides high quality granite at affordable prices for various construction and decorative applications. They operate Rock Mountains near Johannesburg and can be contacted through their website for granite selection and purchasing.