The phrase can be employed synonymously with "volcanic ash." It truly is mined from volcanic ash deposits, or it can be produced by crushing rock pumice. "From June seven to twelve, the main magma achieved the floor of Mount Pinatubo. Since it had misplaced the majority of the gas contained https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/