About: http://webisa.webdatacommons.org/225668571

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	They occur as alteration products of such minerals as biotite and hornblende, and also in schistose rocks.
http://www.w3.org/ns/prov#wasQuotedFrom	wikipedia.org