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Granite Granite is igneous rock, magma ejected from the ground and the intrusion cooling crystallization and metamorphic rocks such as granite formation. With visible crystal structure and texture. It consists of feldspar (usually potash feldspar and Austria feldspar) and quartz composition, mixed with a small amount of mica (biotite or muscovite) and trace minerals, such as: zircon, apatite, magnetite, ilmenite and sphene, etc.. Granite main component is silicon dioxide, the content of about 65% -85%. The chemical nature of the granite weak acidity. Generally, white or gray granite, slightly, due to a mixture of dark crystal, with the appearance of spot, The addition of K-feldspar makes it red or flesh. Granite formed by the crystallization of magma cool slowly, deep below the surface, when the cooling rate of abnormal slow, it form a very rough texture of granite, known as crystalline granite. Granite and other crystalline rocks form the basis of continental plates, it is also exposed to the Earth’s surface is the most common intrusive rocks. Although the granite is considered material by melting or magma igneous rock formation, there is considerable evidence that some of the granite formation of local deformation of the rock or the product of earlier, they are not liquid or melt through the process of re-arranged and re-crystallization. The proportion of granite between the 2.63 to 2.75, its compressive strength is 1,050 ~ 14,000 kg / sq cm (15,000 20, 000 pounds / square inch). The intensity ratio of sandstone as granite, limestone and marble, the more difficult mining. As the granite formation of the structure of the special conditions and firm characteristics of their unique properties as follows: (1) has a good decorative performance, applicable in public places and outdoor decoration. (2) has excellent processing performance: sawing, cutting, polishing, drilling and carving. Its precision can reach 0.5μm below the brightness up to 1600 or more. (3) good resistance to abrasion, 5-10 times higher than cast iron. (4) thermal expansion coefficient is small, not easily deformed, and indium steel similar to that temperature is minimal. (5) elastic modulus, higher than cast iron. (6), rigidity, damping within the large, more than 15 times the steel major. To shock, vibration. (7) granite has a brittle, damaged only a partial loss, does not affect the overall straight sex. (8) granite of the chemical stability, easy to weathering, to acid, alkali and corrosive gases, erosion, chemical resistance and directly proportional to silica content, the service life of 200 years. (9) the granite is not conductive, non magnetic, field position and stability. Typically, the granite is divided into three different categories: Fine-grained granite: the average diameter of feldspar crystals of 1 / 16 ~ 1 / 8 inch. Medium grain granite: feldspar crystals average diameter of about 1 / 4 inch. Coarse-grained granite: feldspar crystals average diameter of about 1 / 2 inch and larger diameter crystals, and some even up to several centimeters. Relatively low density of coarse-grained granite. In recent years, monuments, building stone used in 83% of granite, marble, 17%.