PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Diatomaceous earth is a sedimentary rock composed of primarily of silica, with some alumina and iron oxide as well.
http://www.w3.org/ns/prov#wasQuotedFrom
  • chemistry-blog.com