About: http://webisa.webdatacommons.org/421556972

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	It is rather to be classed with earths than with metals or minerals: and as Ruddle is an earth strongly impregnated with the steams of iron, so is this with those of lead, as appears by its weight, colour, &c.
http://www.w3.org/ns/prov#wasQuotedFrom	port.ac.uk