@Volcanic stone is a functional kind of environmental protection material.@It is a kind of precious and polyporous stone, and formed by volcanic glass ,mineral and air bubble in the process of volcanic eruption.@It contains sodium, magnesium, aluminum, silicon, calcium, titanium, manganese, iron, nickel, cobalt, molybdenum, and other dozens of minerals and trace elements.@It has no radiation .@It has far infrared magnetic wave. Natural stone@Slide-proof, acid & alkali proof@Sound absorbing and insulation
