stone

       Stones are naturally occurring rocks of igneous, sedimentary or metamorphic origin. Stone or Rock structures have existed for as long as history can recall. Stone is a natural material of construction and is obtained from Quarry (open part of the natural rock from which useful material is obtains). It has been used for constructing different components of building like walls, roof, lintels etc. Stones, which are used for construction of structures, are known as building stones. Stone or Rock structures have existed for as long as history can recall. It is the longest lasting building material available, and is usually readily available. There are many types of stone throughout the world, all with differing attributes that make them better or worse for particular uses. Stone is a very dense material so it gives a lot of protection too; its main drawback as a material is its weight. Its energy density is also considered a big drawback, as stone is hard to keep warm without using large amounts of heating resources. Different forms of mortar were used to hold the stones together, cement being the most common material of mortar. Stone buildings can be seen in most major cities; some civilizations built entirely with stone such as the Egyptian pyramids.