PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • Pure carbon forms areamorphous carbon (found in such sources as Charcoal, Coal, Coke, Lignite, and Peat) andthe crystals Graphite, a very soft, dark-grey or black, lustrous material, and Diamond,the hardest substance known.
http://www.w3.org/ns/prov#wasQuotedFrom
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