Volcanic rock (basalt) is a porous stone formed after a volcanic eruption, which is very precious. The magma that erupted during the eruption included gas slag, solid magma, and Yanlei stone. The temperature and pressure dropped rapidly, and chemical and physical changes occurred, so the magma became volcanic rock. Contains a large amount of silicon, potassium, sodium, iron, magnesium, 26 kinds of mineral elements, as well as copper, zinc, chromium, nickel, manganese, etc. The heated volcanic rock will release a large amount of mist-like energy ions and produce magnetic effects and warmth. Effect, hot and cold effect.