About: http://webisa.webdatacommons.org/165903655

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	comprised of impurities such as SiO2, Fe2O3, CaO, and Na2O) from the Condea Vista Company of Tucson, Ariz. was added to the mixture.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com.au