The phrase may be used synonymously with "volcanic ash." It is actually mined from volcanic ash deposits, or it may be made by crushing rock pumice. Pumice mining is often a surface Procedure as deposits tend to be Situated near or for the Earth's surface in volcanic areas. "Despite the https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/