About: http://webisa.webdatacommons.org/187984773

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	However, although the theoretical chemical structure is hydrous magnesium silicate, especially if the talc is a natural product, impurities such as iron oxide and aluminum oxide may be contained.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com