About: http://webisa.webdatacommons.org/109074239

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	Impurities such as sand, clay, iron oxide, or other detritus may be mixed or interbedded with the calcareous material.
http://www.w3.org/ns/prov#wasQuotedFrom	mtech.edu