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The main constituent ore of granite is alkaline feldspar and quartz. Usually, the feldspar content is more than that of quartz, and the two form intercalated tissue. Granite is a granular crystalline rock, and the main constituent ore is alkaline feldspar and quartz. Generally, the content of feldspar is more than that of quartz. There are three types of intercalated structures: (1) different feldspars are produced separately, and (2) different alkaline feldspars are solidified by isomorphism. Body or double crystal cross, (3) and calcium feldspar into a solid solution caused by polycrystalline twin crystal, but 80-85% of which is albite. Alkaline feldspar in petrology refers to feldspar, micro-plagioclase, albite and aragonite or a solid solution synthesized from the above-mentioned feldspar. The percentage of albite contained in aragonite is not lower than 80%. The potassium feldspar (ortho-feldspar or micro-plagioclase) and the albite formula are represented by K (Al Si3O8) and Na (Al Si3O8), respectively. The anorthite has the formula CaAl2 Si3O8. The anorthite and albite components can form a solid solution in various proportions, that is, mineralogy so-called plagioclase minerals or calcium-sodium feldspars.


According to the proportion of different chemical components in 2485 granites around the world, the weight percentage is from heavy to light: SiO2—72.04% Al2O3—14.42% K2O—4.12% Na2O—3.69% CaO—1.82% FeO—1.68% Fe2O3— 1.22% MgO—0.71% TiO2—0.30% P2O5—0.12% MnO—0.05% The mineral content of different varieties is not the same, and there may be pyrite and hornblende. Granite texture is hard and compact, high strength, weathering resistance, corrosion resistance, wear resistance, low water absorption, beautiful color can be preserved for more than 100 years, is a good material for construction, but it is not heat resistant. Granite stone is divided into different grades according to factors such as color, pattern, gloss, structure and material. The Bureau of Minerals of the Ministry of Economic Affairs of Taiwan divides granite into six categories: black, brown, green, gray, light red and deep red.


According to the types of minerals, it can be divided into black granite, muscovite granite, hornblende granite and phlogopite granite. According to structural structure, it can be divided into fine-grained granite, medium-grained granite, coarse-grained granite, porphyritic granite and plaque-like granite. , crystal cave granite and gneissic granite; according to the secondary minerals, can be divided into cassiterite granite, strontium-bearing iron ore, strontium-bearing granite, lithium mica granite, tourmaline granite and so on. Common long-Petrochemical, Yunying lithification, electrical and petrochemical and other self-metamorphism. Granite is a widely distributed rock that is produced in all geological times. Most of the forms are rock foundations, rock strains, rock bells, and the like.


Granite's unique physical characteristics combined with its beautiful patterns make him a good material for the building. Granite can be used from the roof to the floor in the building. The curb of the sidewalk is also crushed to make cement or rock. Fill the dam. Many places or items that need to withstand wind and rain or need to be stored are made of granite. The sign of the "Zhongzheng Memorial Hall" in Taipei and the monument to the People's Heroes in front of the Tiananmen Square in Beijing are all made of granite. The granite has survived for thousands of years, and the famous Egyptian pyramid proves this. The granite structure is uniform, the texture is hard, and the color is beautiful. It is a high-quality building stone. The compressive strength varies depending on the type of stone and the place of origin, and is about 1000-3000 kg/cm. Granite is not easy to weather, beautiful in color, and its appearance can be kept for more than 100 years. Due to its high hardness and wear resistance, it is used as the first choice for high-end architectural decoration projects, hall floors, and open-air carving.


Commercial granite includes the aforementioned granite, gneiss, gneiss granite, granitic schist and what the scholars call the syenite and granodiorite rocks. Rocks of gneiss include minerals, granites, and granular crystals. Commercial granite also includes other similar structures, feldspar crystallites with a small amount of by-component minerals, mainly for decorative users, such as the rock plagioclase known to rock scientists. Gneiss is a coarse crystalline rock composed mainly of silicate minerals. It is inlaid and granular crystal structure. Different types of minerals are arranged in a regular or irregular arrangement. According to the American Society for Testing Materials Classification, granite is divided into ordinary granite and black granite. Ordinary granite is composed of quartz, feldspar, marble, etc., and has black or dark green color due to colored minerals. The whole is often influenced by the color of feldspar. The dark green or black rock of black granite is made of plagioclase, pyroxene, olivine, and hornblende. Therefore, black granite is divided into three types: porphyrite, diabase, and basalt.

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