Talc and Pyrophyllite USGS
Talc and Pyrophyllite in the 20th Century In 1900, domestic production of talc was about 80,000 metric tons and pyrophyllite production was less than 5,000 tons. Prior to 1900, annual production of talc and pyrophyllite were about 50,000 tons and a few hundred tons, respectively. Talc and pyrophyllite were used interchangeably in the early