The material cools so speedily that atoms in the melt are not able to organize them selves into a crystalline framework. So, pumice is really an amorphous volcanic glass generally known as a "mineraloid." “They are available in a lot of sizes and shapes and also have numerous residence employs, https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/