Building stones are the stones which are used in the buildings. Here are some building stones and their building properties –
Granite : Excellent building properties, high strength, high hardness, low absorption value, least porosity, good resistance to frost & weathering, excellent durability.
These rocks have poor resistance to fire.
Basalt : High strength, resistant to weather, being fine textures impervious to moisture.
being very hard they are very difficult to dress in shape.
Limestone : Clay rich varieties are unfit while others are good.
These are dense, compact which are fine textured free from cavities and cracks. Easily dressed up and polished.
Use of limestone as fencing stone should be avoided in areas where air is polluted with industrial gases and also in coastal regions where saltish wind attack .
Marble : An excellent quality marble satisfies all the requisite properties of a building stone.
They are quite strong, uniform in texture, least porous and take an excellent polish. They are suitable for both ornamental stones and for general constructions.
Sandstone : Some sandstones are excellent building stones. They must be free form layers or minerals like mica and chlorite.
Gneiss : When coarsely crystalline and uniformly textured, gneiss are as good stones as granites.
These are varieties light in appearance and free from mica. Dark colored mica-rich and bended types are to be discarded.
Laterite : They are poor in compressive strength which varies from 20-30 km/cm3.
They are quite often used in ordinary type of construction.
Slate : The slaty cleavage makes it an excellent rooting material for ordinary construction. This type of stones are practically impervious to moisture.
Thickly layered slates have a good compressive strength and may find use in sills and for pavements.
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