The fabric cools so speedily that atoms in the melt are not able to organize on their own right into a crystalline composition. As a result, pumice is definitely an amorphous volcanic glass generally known as a "mineraloid." 【Normal STONE】- Lava pumice stone is really a natural and porous stone https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/