Granite is a kind of tectonic rock formed by the lava from volcanic eruption, which is uplifted to the surface of the earth's crust in a molten state under considerable pressure. The magma does not spew out of the ground, but is slowly cooled and solidified underground. Belongs to magmatic rocks (igneous rocks). Granite is mainly composed of quartz, feldspar and mica. Among them, 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 components contained. The rock is hard and dense.
Granite is mainly composed of quartz, feldspar and mica. Among them, 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 components contained. Granite is a rock with a fully crystalline structure. High-quality granite has fine and uniform grains, compact structure, high quartz content, and bright feldspar. Granite has a high silica content and is an acidic rock. Certain granites contain trace amounts of radioactive elements, and such granites should be avoided indoors. Granite has a dense structure, hard texture, good acid and alkali resistance, and good weather resistance, and can be used outdoors for a long time.
Granite is a unique material, these physical characteristics are mainly manifested as porosity/permeability: The physical permeability of granite is almost negligible, between 0.2%~4% Thermal stability: granite has high strength and thermal stability, It will not change due to changes in outside temperature, and because of its high density, granite will not change due to changes in temperature and air composition. Granite has strong corrosion resistance, so it is widely used in the storage of chemical corrosion products.
Granite has a dense structure, high compressive strength, low water absorption, high surface hardness, good chemical stability, strong durability, but poor fire resistance. Granite has a fine-grained, medium-grained, and coarse-grained granular structure, or a variegated structure. Its 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 frost resistance. The hardness of granite is high, its Mohs hardness is about 6, its density is between 2.63 g/cm3 and 2.75 g/cm3, its compressive strength is 100-300MPa, of which fine-grained granite can be as high as 300MPa or more, and its bending strength is generally in 10~30Mpa. Granite is often produced in the form of rock foundation, rock stock, rock block, etc., and is controlled by the regional tectonic structure. Generally, it is relatively large in scale and widely distributed, so it is convenient to mine, easy to produce large materials, and its joints develop regularly. , which is conducive to the mining of stones with regular shapes.
