Bluestone is a kind of gray or gray sedimentary rock (about 15% of lithosphere) which is widely distributed in the earth's crust and is an important constituent rock in carbonate rocks. Bluestone is widely used in the living room table after being cut into plates by stonemasons from deep mountains. Compared with natural marble, bluestone has the advantage that its main composition is calcium carbonate, no pollution and no radiation.
Bluestone is also an ideal material for the construction industry. It is widely used in many fields such as highway, railway and sand for construction.