The volcanic mud is a mixture of volcanic ash and volcanic powder. The mud may form at volcanic eruption and fall from the sky as mud rain, or airslake from volcanic block . It is fine and gray color. The volcanic mud are used in the health and beauty industry as volcanic mud masks, mud baths etc. The volcanic mud also are used in photics glass industry and electron industry as abrasive. Such as polishing eyeglass and lens, polishing PCB etc.