Bluestone is a kind of gray or gray-white sedimentary rock (about 15% of the lithosphere) that is widely distributed in the crust and is formed in the lacustrine basin. It is an important constituent rock in carbonate rocks. Bluestone is excavated and cut into slabs from deep mountains by masons and is widely used in living room table tops or cabinet counters. Compared with natural marble, the advantage of bluestone is that the main component is calcium carbonate, which is non-polluting and non-radiating; bluestone is also an ideal material for the construction industry. , widely used in highways, railways, construction sand and other fields.