It 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. belongs to magmatic rock. Because of its high silica content, it belongs to acid rock.Granite has compact structure, hard texture, acid and alkali resistance, and good weather resistance. It can be used outdoors for a long time.