The fabric cools so immediately that atoms in the soften are unable to organize on their own right into a crystalline structure. Therefore, pumice is undoubtedly an amorphous volcanic glass generally known as a "mineraloid." Porosity: Pumice is highly porous, with up to 90% of its volume consisting of vacant https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/