About: http://webisa.webdatacommons.org/130168976

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Pumice is light gray in color and usually contains a large percentage of silica.Pumice in powdered form is widely used as an abrasive and as a polishing agent for glass, marble, and other substances.
http://www.w3.org/ns/prov#wasQuotedFrom	howstuffworks.com