About: http://webisa.webdatacommons.org/57914106

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	Like all glass and some other types of naturally occurring rocks, obsidian breaks with a characteristic conchoidal fracture.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com