The material cools so quickly that atoms during the melt are not able to arrange themselves into a crystalline construction. Hence, pumice is definitely an amorphous volcanic glass referred to as a "mineraloid." Pumice mining is typically a area operation as deposits in many cases are Found in the vicinity https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/