About: http://webisa.webdatacommons.org/135611458

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 preferred clay materials generally include interlayer cations such as Na+, Ca+2, K+, Mg+2, NH4 +and the like, including mixtures thereof.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk