<http://schema.org/description>
"The chief supply of native silver comes from the lead mines of Northumberland, this engraving shows a large lump of silver ore weighing 2 cwts."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mediastorehouse.com/bullion-office-bank-of-england-english-silver/print/4391355.html>