About: http://webisa.webdatacommons.org/389820213

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	Sapphires, garnets, emeralds, smoky quartz, and other gems and crystals are shown, together with such useful products as kaolin, fire-clay, graphite, and talc, the last especially valuable in the manufacture of pencils.
http://www.w3.org/ns/prov#wasQuotedFrom	iit.edu