Pumice synonyms

Pumice stone is also exported from Lipari (II,oio tons in 1904).

For efficiency the operation must be conducted with small quantities; caking may be prevented by mixing the substance with sand or powdered pumice, or, better, with iron filings, which also renders the decomposition more regular by increasing the conductivity of the mass.

Large areas are overlain with trachyte, basalt, obsidian, tuff and pumice.

Obsidians occur in many parts of the world along with rhyolites and pumice.

The vegetation of Krakatoa was completely exterminated in 1883 by a thick coat of red-hot pumice.