Stones The stones also used for masonry should be hard , durable , tough , and sound , free from weathering , defects like cavities , cracks , sand holes , injurious veins , patches of loose or soft materials etc. The stones should be obtained only from approved quarry.The stone should be obtained by quarrying large massive rock and not by breaking small size.Boulders having rounded faces. Rocks from which building stones are obtained , are divided into three groups : 1- Igneous rock 2- Sedimentary rocks 3- Metamorphic rocks 1- Igneous rock It has been formed by agency of heat , the molten material subsequently become soli ified.The cheif building used in steps , facing work , walls etc.However , it is unsuitable for carving work.It is more suitable for heavy engineering works such as docks , break waters, light houses , masonry bridges and piers. 2- Sedimentary rocks It has been formed chiefly through the agency of water.Most of these have been derived fro
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