Granite has a wide variety of conditions due to the complex formation of components, and there are many types of classification. According to the minerals contained, it is divided into black granite, muscovite granite, hornblende granite, and two mica granite. According to the structural structure, it can be divided into fine grain granite, medium grain granite, coarse grain granite, porphyritic granite, plaque-like granite, crystal granite and granitic granite. According to the sub-minerals contained, it can be divided into cassiterite-containing granite, strontium-bearing iron ore, strontium-containing granite, lithium mica granite, tourmaline granite and so on. Common long-Petrochemical, Yunying lithification, electrical and petrochemical and other self-metamorphism.
The granite structure is compact, has high compressive strength, low water absorption, large surface hardness, good chemical stability and durability, but poor fire resistance. Granite is a granular structure with fine, medium or coarse grains, or a plaque-like structure. The particles are uniform and fine, the gap is small (the porosity is generally 0.3%~0.7%), and the water absorption rate is not high (the water absorption rate is generally 0.15). %~0.46%), with good antifreeze performance. The hardness of granite is high, its Mohs hardness is about 6, and its density is between 2.63g/cm3 and 2.75g/cm3. Its compressive strength is 100-300MPa, and fine-grained granite can be as high as 300MPa or more. At 10~30Mpa. Granite is often produced in the form of rock foundations, rock strains, rock blocks, etc., and is controlled by regional geodetic structures. Generally, the scale is relatively large and the distribution is relatively wide. Therefore, it is easy to mine, easy to produce large materials, and its joint development is regular. It is conducive to the mining of stone with shape rules. Granite has a high rate of desertification and can be processed in various ways. Also, granite is not easily weathered and can be used as an outdoor decorative stone. Granite has a uniform texture, although the color is mainly light, but it is also rich in red, white, yellow, green, black, purple, brown, beige, blue, etc., and its color changes little, suitable for large The use of the area.
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