Pumice and pumicite
Production of pumice in the United States during 2012 was estimated to be 515 kt (568,000 st), a 5percent increase compared to 2011. The unit value of pumice varied widely by end use in 2012. Pumice used as an abrasive was priced at /t (/st), while specialtygrade pumice, used in cosmetics, filtration or precision grinding, could be ...