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Physically, Commercial granites are Hard, Compact rocks with fine to coarse grains of metamorphic or igneous origin.
| Hardness | 6 to 7 on Mohs Scale |
|---|---|
| Density | 2.6 to 2.8 Kg/cm3 |
| Compressive Strength | 140 to 210 N/mm2 |
| Modulus of Rupture | 15 to 25 N/mm2 |
| Water Absorption | 0.1-0.6% |
| Average Wear | Less than 1% |
| Porosity | Quite low |
| Weather Impact | Resistant |
Chemically, they are igneous/metamorphic rocks composed of quartz, feldspar & ferromagnesian minerals like kiloliter, chlorite, garnet, etc. Typical granite will have following chemical composition:
| Silica (SiO2) | 70-75% |
|---|---|
| Al2O3 | 10-15% |
| CaO+MgO | Less than 0.5% |
| FeO + Fe2O3 | 2-4% |
| Alkalies | 4-6% |
| TiO2 | Less than 0.5% |
| Loss On Ignition (LOI) | Less than 0.5% |
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