specification of Stone
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- 12. Granite is an igneous rock, ordinarily composed of feldspar, mica, and silica or quartz. Qualities of Granite The hardest and most durable granites contain a greater proportion of quartz and a smaller proportion of feldspar and mica. Granite has a pearly lustre. The colour of common granite varies from white through yellow to deep red, and the stone is generally classified as gray and red. Medium grained stone is best fitted for building construction. Fine grained stone can be carved and polished, but, on account of its extreme hardness, it cannot be worked readily.
- 13. Classification Granites are classified under four grades depending upon the compressive strength and abrasive resistance as specified below
- 14. Sandstone A Type of Sedimentary rock Sandstone consists of fragments of other rocks cemented together. The cementing material may be silica, oxide of iron, clay, or carbonate of lime. Qualities of sandstone The best stone is characterized by small grains with a small proportion of cementing material. When broken, it has a bright, clear, sharp fracture. The colours of sandstone are white, cream, yellow, dark brown, blue, and red Technical Information of different Sandstones
- 15. Metamorphic Rocks Marble Metamorphosed limestone gives the masonry material known as marble. It is easily dressed to a smooth surface and polished, and is considered one of the most valuable building materials. Qualities of marble Marble can be obtained in many colours, some of which are white, gray, red, blue, green, and black. It is easy to carve; the finer the grains of the stone, the more suitable it is for this purpose. It resists frost and moisture well, but like all limestones it does not withstand fire. Classification Marble has been classified into 10 groups by Bureau of Indian Standards (IS 11301969) on the basis of colour, shade and pattern. 1. Plain White Marble 2. Panther Marble 3. White Veined Marble 4. Plain Black Marble 5. Black Zebra Marble 6. Green Marble 7. Pink Adanga Marble 8. Pink Marble 9. Grey Marble 10. Brown Marble
- 17. 1. Dressing of stones is tedious, laborious and time consuming job. 2. Desired strength and quality not available at moderate rates especially in plain areas. 3. RCC, Steel are alternatives to stones and gives more strength and flexibility. 4. Stone structure design can’t give freeness and flexibility to the designer.