About: http://webisa.webdatacommons.org/283231601

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	The colored varieties usually contain traces of silver, iron, cadmium, mercury, manganese and other metals.
http://www.w3.org/ns/prov#wasQuotedFrom	nevada-outback-gems.com