The phrase can be employed synonymously with "volcanic ash." It really is mined from volcanic ash deposits, or it might be made by crushing rock pumice. Inverse pityriasis rosea generally will cause a rash around the armpits or groin. It can be an atypical form of pityriasis rosea. Find out https://edenproductsltd.co.uk/2025/04/17/the-history-of-pumice-stone-from-ancient-civilisations-to-modern-day-uses/