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Electrum

earth science Maturity 11-13 Next article →

Electrum is a naturally occurring alloy composed primarily of gold and silver. An alloy is a mixture of two or more metals.

Electrum on quartz Telluride (cropped)
Electrum on quartz Telluride (cropped)

In addition to gold and silver, electrum often contains trace amounts of copper and platinum. The appearance of the metal depends on its specific composition. Depending on the proportions of gold and silver, the color can range from a pale yellow to a very bright yellow. While it occurs in nature, humans can also produce electrum artificially. When it is man-made, it is sometimes referred to as "green gold."

This metal has been part of human history for thousands of years. As early as the third millennium BC, people in the Old Kingdom of Egypt used electrum. They sometimes used it as an exterior coating for the pyramidia, which are the tips of pyramids and obelisks.

Mumified head IMG 0515
Mumified head IMG 0515

Ancient civilizations also used the metal to craft beautiful drinking vessels.

Cup Idalion Louvre N3455
Cup Idalion Louvre N3455

The name "electrum" is actually a Latinized version of an ancient Greek word, ḗlektron. In Greek, this word could mean either amber or an alloy of gold and silver. Because of its light color, ancient people often called it "white gold."

Electrum played a foundational role in the history of economics. It was used to create the first known metal coins.

BMC 06
BMC 06

These coins date back to the last quarter of the 7th century BC, between 625 and 600 BC. Some of these early coins were found in Lydia, and others were found near the Temple of Artemis at Ephesus. It is believed that electrum was used for coinage in Lydia during the reign of King Alyattes. Electrum was often a better choice for making coins than pure gold. This was because electrum is harder and more durable than gold. Additionally, the technology required to refine pure gold was not widely available at that time.

In Lydia, the government minted electrum into specific units of currency. The main unit was called a stater, which meant "standard."

Πακτωλός
Πακτωλός

Each stater weighed approximately 14.1 grams. This amount was quite valuable, representing about one month of pay for a soldier. To make smaller transactions easier, the Lydians created fractions of the stater. These included the trite, which was one-third of a stater, and the hekte, which was one-sixth. They even made much smaller pieces, such as 1/12 or 1/24 of a stater. Larger denominations, such as a single one-stater coin, were also produced.

Using electrum for money created some difficult economic problems. Because the metal was a natural alloy, the exact amount of gold in each piece could vary. This made it hard to determine the intrinsic value, or the actual worth of the metal, in every coin. This variation hampered widespread trading.

Griffin protome Louvre Bj39
Griffin protome Louvre Bj39

Some historians suggest that one reason for the invention of coinage was to increase profits through seigniorage. Seigniorage is the profit made by a government when it issues currency. By issuing coins with a lower gold content than the natural metal, the government could gain more value. Eventually, these difficulties were solved when the Croeseids, which were coins made of pure gold and silver, were introduced.

Despite these issues, electrum currency remained in use for a long time. It was common until approximately 350 BC. One reason for its long life was its high value. For example, one 14.1 gram stater was worth as much as ten 14.1 gram silver pieces. We can see how the gold content changed over different historical periods through scientific analysis. In the area of Phocaea around 600 BC, the gold content was about 55.5%. During the early classical period, the gold in Phocaea was 46%, while in Mytilene it was 43%. By 326 BC, the gold content in these areas had dropped to an average of 40% to 41%.

As empires changed, the composition of electrum continued to shift. During the Hellenistic period, the Carthaginians issued electrum coins where the proportion of gold regularly decreased. In the later Eastern Roman Empire, which was controlled from Constantinople, the purity of gold coinage was also reduced.

Histamenon nomisma-Alexius I-sb1776
Histamenon nomisma-Alexius I-sb1776

The study of electrum connects many different fields of science and history. It links metallurgy, the study of metals, with archaeology and ancient economics. By looking at the specific mix of metals in an artifact, researchers can learn about the refining technologies and trade patterns of ancient civilizations.

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🖼️ Images & Media (7)
File:Electrum on quartz Telluride (cropped).jpg
Electrum on quartz Telluride (cropped).jpg
File:Πακτωλός.jpg
Πακτωλός.jpg
File:Cup Idalion Louvre N3455.jpg
Cup Idalion Louvre N3455.jpg
File:Griffin protome Louvre Bj39.jpg
Griffin protome Louvre Bj39.jpg
File:BMC 06.jpg
BMC 06.jpg
File:Histamenon nomisma-Alexius I-sb1776.jpg
Histamenon nomisma-Alexius I-sb1776.jpg
File:Mumified head IMG 0515.jpg
Mumified head IMG 0515.jpg
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