Electrum is a naturally occurring alloy of gold and silver, with trace amounts of copper and other metals. It has also been produced artificially, and is often known as green gold. The ancient Greeks called it'gold' or'white gold', as opposed to'refined gold'. Its colour ranges from pale to …
Natural Electrum "wires" on quartz, historic specimen from the old Smuggler-Union Mine, Telluride, Colorado, USA.
The Pactolus river, from which Lydia obtained electrum for its early coinage.
Early 6th century BCE Lydian electrum coin (one-third stater denomination), one of the oldest known coins