About: http://webisa.webdatacommons.org/247857550

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	Diamond is the hardest known substance, being composed of very densely packed carbon (C).
http://www.w3.org/ns/prov#wasQuotedFrom	ar.gov