Lava rock(commonly known as pumice or porous basalt)is a very precious porous stone formed by volcanic glass,minerals and bubbles after volcanic eruption.
It's advantage is many pores,light weight,high strength,thermal insulation.
It is widely used to landscaping, water filtration, aquarium landscaping, architecture, flower pavement, soil improvement, aromatherapy box,grow flowers,barbecue,wall piling, aquarium landscape,facial mask.