Volcanic rocks (basalt) is formed after the eruption the porous shaped stone, very precious. Volcanic rocks rich in sodium, magnesium, aluminum, silicon, calcium, manganese, iron, phosphorus, nickel, cobalt and other minerals, its surface is uniformly covered with holes, antique color, conductivity, non-radioactive, never fade characteristics . Weathering resistance, high temperature resistance, sound absorption, thermal resistance of the absorbent non-slip, adjust the humidity of the air, improve the ecological environment, the development and utilization of installed preferred stone for modern architecture. For high-end architectural interior and exterior decoration, hotels, guesthouses, villas, municipal roads, squares, residential areas, gardens, and a variety of antique retro European architecture. Physical properties, appearance shape: no sharp granular flow resistance is small, easy to plug, water distribution uniform gas distribution; surface roughness, biofilm is fast, easy to fall off when the microbial membrane backwash. 2, the porous: volcanic rocks is a natural cellular porous, is the best environment for the growth of floc. Mechanical strength: the national quality inspection departments 5.08Mpa Practice has proved to be able to endure different intensity hydraulic shearing, life is much longer other media. 4, Density: the moderate density backwash easy suspended and not run material, energy saving. The chemical properties volcanic rocks (IgneousRock,) by magma (Magma) directly solidified. The high temperature of the magma Results from the liquid cooling products into a variety of minerals, mineral and then closely integrated into igneous rock. Different chemical composition of the magma, and finally become a different mineral composition of igneous rock, variety, hundreds of subdivision. More to the center of the earth due to the insulation effect of the earth's crust, the higher the temperature. Core due to high pressure solid state. Crust under high temperature material in liquid state is the magma. According to modern volcanic eruption out of the lava that, the silicate magma main component. Wherein SiO2 content between 80-30%; metal oxides such as AI2O3, Fe2O3, FeO, MgO, CaO, Na2O, accounting for 20-60%. Others, such as heavy metals, non-ferrous metals, rare metals and radioactive elements, their total does not exceed 5%. In addition, the magma also contains some volatile components, mainly H2O, CO2, H2S, F, Cl, and so on. According to the level of classification of the silicon content in four major categories of volcanic rock the acidic (ACIDIC), neutral (Intermediate), basic (Basic), and ultrabasic (Ultrabasic).