The word can be utilized synonymously with "volcanic ash." It can be mined from volcanic ash deposits, or it may be produced by crushing rock pumice. “It’s seriously vital that you normally thoroughly clean it following each individual use given that bacteria can increase about the area from the stone,” https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/