Volcanic rock (volcanic rock or pumice stone) is a kind of vitreous lava with dense pores formed by the rapid overflow and
expansion of internal gas due to the sharp decrease of pressure after the sudden cooling of magma in the process of volcanic eruption.Its stomatal volume accounts for more than 50% of the rock volume.Because of the pores, light weight, can float on the water and is known as pumice.Its characteristic is high intensity, heat preservation, heat insulation, sound-absorbing, fire prevention, acid and alkali resistance, corrosion resistance, and no pollution, no radioactivity, etc.
Volcanic stone powder mask with volcanic mud powder moxibustion with red and black volcanic mud powder fine mineral mud
