The term can be used synonymously with "volcanic ash." It is actually mined from volcanic ash deposits, or it may be produced by crushing rock pumice. As you’re soaking your skin, also soak your pumice stone in heat drinking water. Never ever utilize a dry pumice stone on your skin. https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/