About: http://webisa.webdatacommons.org/431403411

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	Doubly refracting crystals, such as calcite and quartz, break up light rays into two parts, called ordinary rays and extraordinary rays, which are polarized at right angles to each other.
http://www.w3.org/ns/prov#wasQuotedFrom	noteaccess.com