The word can be employed synonymously with "volcanic ash." It can be mined from volcanic ash deposits, or it could be made by crushing rock pumice. While you’re soaking the skin, also soak your pumice stone in warm water. Never make use of a dry pumice stone on the skin. https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/