Stone is a material of the earth's crust, composed of one or more minerals linked together. In geology, stones made from cooled molten materials are called igneous stones. The igneous stones are divided into two sections of intrusive igneous stones and outer igneous stones. Outer igneous stones are the result of a volcanic process and melting of molten material from the crater of the volcano, but internal igneous stones are shaped as a result of magma freezing inside the earth's crust. These stones are frozen in various forms in the earth's crust. Granite stones are composed of three minerals namely quartz, feldspar and mica, along with some other impurities.