Electrum is a naturally occurring or deliberately prepared alloy of gold and silver, often with small amounts of copper and other trace elements. Its colour ranges from pale yellow to yellow-green depending on the gold content. Electrum holds a special place in numismatic history as being the material of the earliest coins, struck in western Asia Minor in the 7th–6th centuries BC. Its variable composition, however, made it difficult to standardize, and it was gradually replaced by separate gold and silver issues.
, Nomisma (el)
