The story of black granite

Writer： admin Time：2020-11-20 21:56 Browse：℃

Material introduction of granite: Granite is a kind of tectonic rock formed by volcanic erupting lava in a molten state under considerable pressure and uplifting to the surface of the crust. The magma does not spray out of the ground, but is slowly cooled and solidified under the ground. It is a kind of deep acidic igneous rock, belonging to magmatic rock (igneous rock). Granite is mainly composed of quartz, feldspar and mica. The content of feldspar is 40%~60%, and the content of quartz is 20%~40%. Its color depends on the type and quantity of the ingredients. The rock is hard and dense.

Granite is a unique material. The physical characteristics of these materials are mainly shown in the following porosity/permeability: the physical permeability of granite is almost negligible, between 0.2% and 4%. Thermal stability: granite has high strength and heat stability , It will not change due to changes in outside temperature. Granite will not change due to changes in temperature and air composition due to its high density. Granite has strong corrosion resistance, so it is widely used in reserve chemical corrosion products. Ductility: The ductility coefficient of granite ranges from 4.7×10-6 to 9.0×10-6. Color: The color and material of granite are highly consistent. Hardness: Granite is the hardest building material, and because of its super hardness, it has good wear resistance. Composition: Granite is mainly composed of quartz, orthoclase and plagioclase. The most primitive granite is mainly composed of the following three parts: feldspar, quartz and biotite. The proportion of each component is generally determined by the color and material, but generally the proportion of feldspar is 65%~90%, quartz 10%~60%, biotite 10%~15%

1. Density: 2790~3070 kg/m3;
2. Pressure : 1000~3000 kg/cm2;
3. Elastic modulus: 1.3~1.5×106 kg/cm3;
4. Water absorption: 0.13%;
5. Shore hardness:> HS 70;
6. Proportion: 2.6~2.75
Granite is mainly composed of feldspar, quartz, and biotite, but it is also accompanied by the presence of other minerals. The various proportions are mainly as follows:
Composition SiO2 Al2O3 CaO MgO Fe2O3
Content (%) 67-76 12-17 0.1-2.7 0.5-1.6 0.2-0.9