The material cools so immediately that atoms inside the melt are unable to set up them selves into a crystalline framework. As a result, pumice is undoubtedly an amorphous volcanic glass referred to as a "mineraloid." Porosity: Pumice is very porous, with up to 90% of its quantity consisting of https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/