About: http://webisa.webdatacommons.org/284150527

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	Gypsum is a soft mineral used as in plaster and is composed of calcium sulfate dihydrate.
http://www.w3.org/ns/prov#wasQuotedFrom	ck12.org