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. The two types of intercalated tissue are as follows: (1) different components of alkaline feldspar are produced separately, and (2) different alkaline feldspars are solidified by homomorphic 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, granite composition material plagioclase, albite and aragonite or synthetic solid solution from the above feldspar. The percentage of albite contained in aragonite is not low. 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 composition of different varieties is not the same, and there may be pyrite and amphibole. 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.
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