Pumice and pumicite

The estimated domestic production of pumice and pumicite in 2002 was 950 kt (1.04 million st), a 3.2 percent increase compared with the revised total of 2001, according to the U.S. Geological Survey (USGS). The amount of pumice and pumicite sold or used in the United States was revised for the years 1998 through 2001 in the USGS Mineral Commodity Summaries, 2003.