Pumice is a common product of volcanic eruptions (formation of Plinius and ignimbrit) and generally forms zones at the top of silicate lava. Pumice varies in terms of density according to the thickness of the material between solid waves; many samples float in water. –Improve soil struckcture –Loosens heavy soil,prevent soil from compacting –Retains excess moisture within it's porous structure –Improve drainage in any kind of soil mix –Good subtrate mix,for Succulent,cactus,carnivorous plant,common potted plant. –slightly heavler than perlite –Does not retain as much water as vermiculite –Does not decompose