About: http://webisa.webdatacommons.org/417242247

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	substance in particular directions is split into two distinctly different rays that are strongly polarized at 90 degrees to each other and that travel at widely different indices of refraction;thus, calcite has a high birefringence.
http://www.w3.org/ns/prov#wasQuotedFrom	dot.gov