About: http://webisa.webdatacommons.org/275333292

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	Many of the pebbles as well as some of these larger rocks have compositions that are high in silicon, and in alkaline elements including sodium, potassium and rubidium.
http://www.w3.org/ns/prov#wasQuotedFrom	spaceflight101.com