About: http://webisa.webdatacommons.org/312033146

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	Materials present in nature, such as quartz and other forms of silicon dioxide, are of the ???electret??? type.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com