About: http://webisa.webdatacommons.org/240299172

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	Rarely, quartz or chalcedony is found; it resembles the deposit around hot springs or in fissures, and, like the obsidian, is in fragments too small to be utilized except as a grinding or polishing material for smoothing wrought objects.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com