About: http://webisa.webdatacommons.org/335435416

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	As a free mineral, not combined in clay and other materials, it occurs as quartz, silica sand, sandstone, and flint pebbles.
http://www.w3.org/ns/prov#wasQuotedFrom	nzdl.org