About: http://webisa.webdatacommons.org/419026969

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	It is a trace material in coal, and is normally found in igneous rock, e.g. granite or volcanoes.
http://www.w3.org/ns/prov#wasQuotedFrom	pjmedia.com