Electrum is a naturally occurring

alloy An alloy is a mixture of chemical elements of which at least one is a metal. Unlike chemical compounds with metallic bases, an alloy will retain all the properties of a metal in the resulting material, such as electrical conductivity, ductilit ...

gold Gold is a chemical element with the symbol Au (from la, aurum) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile me ...

and

silver Silver is a chemical element with the symbol Ag (from the Latin ', derived from the Proto-Indo-European ''h₂erǵ'': "shiny" or "white") and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical ...

, with trace amounts of

copper Copper is a chemical element with the symbol Cu (from la, cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkis ...

and other metals. Its color ranges from pale to bright yellow, depending on the proportions of gold and silver. It has been produced artificially, and is also known as "

green gold Electrum is a naturally occurring alloy of gold and silver, with trace amounts of copper and other metals. Its color ranges from pale to bright yellow, depending on the proportions of gold and silver. It has been produced artificially, and ...

".Emsley, John (2003
Nature's building blocks: an A–Z guide to the elements
Oxford University Press. . p. 168 Electrum was used as early as the third millennium BC in

Old Kingdom of Egypt In ancient Egyptian history, the Old Kingdom is the period spanning c. 2700–2200 BC. It is also known as the "Age of the Pyramids" or the "Age of the Pyramid Builders", as it encompasses the reigns of the great pyramid-builders of the Fourt ...

, sometimes as an exterior coating to the

pyramidion A pyramidion (plural: pyramidia) is the uppermost piece or capstone of an Egyptian pyramid or obelisk. Speakers of the Ancient Egyptian language referred to pyramidia as ''benbenet'' and associated the pyramid as a whole with the sacred ...

s atop ancient Egyptian

pyramid A pyramid (from el, πυραμίς ') is a structure whose outer surfaces are triangular and converge to a single step at the top, making the shape roughly a pyramid in the geometric sense. The base of a pyramid can be trilateral, quadrilat ...

s and

obelisk An obelisk (; from grc, ὀβελίσκος ; diminutive of ''obelos'', " spit, nail, pointed pillar") is a tall, four-sided, narrow tapering monument which ends in a pyramid-like shape or pyramidion at the top. Originally constructed by An ...

s. It was also used in the making of ancient drinking vessels. The first known metal

coin A coin is a small, flat (usually depending on the country or value), round piece of metal or plastic used primarily as a medium of exchange or legal tender. They are standardized in weight, and produced in large quantities at a mint in order t ...

s made were of electrum, dating back to the end of the 7th century or the beginning of the 6th century BC. For several decades, the

medal A medal or medallion is a small portable artistic object, a thin disc, normally of metal, carrying a design, usually on both sides. They typically have a commemorative purpose of some kind, and many are presented as awards. They may be int ...

s awarded with the

Nobel Prize The Nobel Prizes ( ; sv, Nobelpriset ; no, Nobelprisen ) are five separate prizes that, according to Alfred Nobel's will of 1895, are awarded to "those who, during the preceding year, have conferred the greatest benefit to humankind." Alfr ...

have been made of gold-plated green gold.

Etymology

The name "electrum" is the

Latin Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the ...

ized form of the

Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...

word ἤλεκτρον (''ḗlektron''), mentioned in the ''

Odyssey The ''Odyssey'' (; grc, Ὀδύσσεια, Odýsseia, ) is one of two major ancient Greek epic poems attributed to Homer. It is one of the oldest extant works of literature still widely read by modern audiences. As with the ''Iliad'', th ...

'' referring to a metallic substance consisting of gold alloyed with silver. The same word was also used for the substance

amber Amber is fossilized tree resin that has been appreciated for its color and natural beauty since Neolithic times. Much valued from antiquity to the present as a gemstone, amber is made into a variety of decorative objects."Amber" (2004). In ...

, likely because of the pale yellow color of certain varieties. It is from amber’s

electrostatic Electrostatics is a branch of physics that studies electric charges at rest ( static electricity). Since classical times, it has been known that some materials, such as amber, attract lightweight particles after rubbing. The Greek word for amb ...

properties that the modern English words "electron" and "electricity" are derived. Electrum was often referred to as "

white gold Pure gold is slightly reddish yellow in color, but colored gold in various other colors can be produced by alloying gold with other elements. Colored golds can be classified in three groups: * Alloys with silver and copper in various proportions ...

" in ancient times, but could be more accurately described as "pale gold", as it is usually pale yellow or yellowish-white in color. The modern use of the term ''white gold'' usually concerns

alloyed with any one or a combination of

nickel Nickel is a chemical element with symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel is a hard and ductile transition metal. Pure nickel is chemically reactive but large pieces are slow ...

platinum Platinum is a chemical element with the symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish , a diminutive of "silver". Pla ...

and

palladium Palladium is a chemical element with the symbol Pd and atomic number 46. It is a rare and lustrous silvery-white metal discovered in 1803 by the English chemist William Hyde Wollaston. He named it after the asteroid Pallas, which was itself na ...

to produce a silver-colored gold.

Composition

Electrum consists primarily of gold and silver but is sometimes found with traces of platinum, copper, and other metals. The name is mostly applied informally to compositions between about 20–80% gold and 20–80% silver atoms, but these are strictly called gold or silver depending on the dominant element. Analysis of the composition of electrum in ancient Greek coinage dating from about 600 BC shows that the gold content was about 55.5% in the coinage issued by

Phocaea Phocaea or Phokaia (Ancient Greek: Φώκαια, ''Phókaia''; modern-day Foça in Turkey) was an ancient Ionian Greek city on the western coast of Anatolia. Greek colonists from Phocaea founded the colony of Massalia (modern-day Marseille, in ...

. In the early classical period, the gold content of electrum ranged from 46% in Phokaia to 43% in

Mytilene Mytilene (; el, Μυτιλήνη, Mytilíni ; tr, Midilli) is the capital of the Greek island of Lesbos, and its port. It is also the capital and administrative center of the North Aegean Region, and hosts the headquarters of the University o ...

. In later coinage from these areas, dating to 326 BC, the gold content averaged 40% to 41%. In the

Hellenistic period In Classical antiquity, the Hellenistic period covers the time in Mediterranean history after Classical Greece, between the death of Alexander the Great in 323 BC and the emergence of the Roman Empire, as signified by the Battle of Actium in ...

, electrum coins with a regularly decreasing proportion of gold were issued by the

Carthaginians The Punic people, or western Phoenicians, were a Semitic people in the Western Mediterranean who migrated from Tyre, Phoenicia to North Africa during the Early Iron Age. In modern scholarship, the term ''Punic'' – the Latin equivalent of the ...

. In the later

Eastern Roman Empire The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantin ...

controlled from

Constantinople la, Constantinopolis ota, قسطنطينيه , alternate_name = Byzantion (earlier Greek name), Nova Roma ("New Rome"), Miklagard/Miklagarth (Old Norse), Tsargrad ( Slavic), Qustantiniya ( Arabic), Basileuousa ("Queen of Cities"), Megalopolis ( ...

, the purity of the gold coinage was reduced, and an alloy that can be called electrum began to be used.

History

Electrum is mentioned in an account of an expedition sent by Pharaoh

Sahure Sahure (also Sahura, meaning "He who is close to Re") was a pharaoh of ancient Egypt and the second ruler of the Fifth Dynasty (c. 2465 – c. 2325 BC). He reigned for about 13 years in the early 25th century BC during the Old Kingdom Period. ...

of the

Fifth Dynasty of Egypt The Fifth Dynasty of ancient Egypt (notated Dynasty V) is often combined with Dynasties III, IV and VI under the group title the Old Kingdom. The Fifth Dynasty pharaohs reigned for approximately 150 years, from the early 25th century BC until ...

. It is also discussed by

Pliny the Elder Gaius Plinius Secundus (AD 23/2479), called Pliny the Elder (), was a Roman author, naturalist and natural philosopher, and naval and army commander of the early Roman Empire, and a friend of the emperor Vespasian. He wrote the encyclopedic ' ...

in his ''

Naturalis Historia The ''Natural History'' ( la, Naturalis historia) is a work by Pliny the Elder. The largest single work to have survived from the Roman Empire to the modern day, the ''Natural History'' compiles information gleaned from other ancient authors. ...

''. Electrum is also mentioned in the

Hebrew Scriptures The Hebrew Bible or Tanakh (;"Tanach"
'' Ezekiel is said to have had a vision of Jehovah on a celestial chariot (Ezekiel 1:4).

Early coinage

The earliest known electrum coins, Lydian and East Greek coins found under the

Temple of Artemis The Temple of Artemis or Artemision ( gr, Ἀρτεμίσιον; tr, Artemis Tapınağı), also known as the Temple of Diana, was a Greek temple dedicated to an ancient, local form of the goddess Artemis (identified with Diana, a Roman go ...

at Ephesus, are currently dated to the last quarter of the 7th century BC (625–600 BC). Electrum is believed to have been used in coins c. 600 BC in Lydia during the reign of

Alyattes Alyattes (Lydian language: ; grc, Ἀλυάττης ; reigned c. 635-585 BC), sometimes described as Alyattes I, was the fourth king of the Mermnad dynasty in Lydia, the son of Sadyattes, grandson of Ardys, and great-grandson of Gyges. ...

. Electrum was much better for coinage than gold, mostly because it was harder and more durable, but also because techniques for refining gold were not widespread at the time. The discrepancy between gold content of electrum from modern Western

Anatolia Anatolia, tr, Anadolu Yarımadası), and the Anatolian plateau, also known as Asia Minor, is a large peninsula in Western Asia and the westernmost protrusion of the Asian continent. It constitutes the major part of modern-day Turkey. The ...

(70–90%) and ancient Lydian coinage (45–55%) suggests that the Lydians had already solved the refining technology for silver and were adding refined silver to the local native electrum some decades before introducing the pure silver coins cited below. In Lydia, electrum was minted into coins weighing , each valued at ''

stater The stater (; grc, , , statḗr, weight) was an ancient coin used in various regions of Greece. The term is also used for similar coins, imitating Greek staters, minted elsewhere in ancient Europe. History The stater, as a Greek silver curre ...

'' (meaning "standard"). Three of these coins—with a weight of about —totaled one stater, about one month's pay for a soldier. To complement the stater, fractions were made: the ''trite'' (third), the ''hekte'' (sixth), and so forth, including of a stater, and even down to and of a stater. The stater was only about to . Larger denominations, such as a one stater coin, were minted as well. Because of variation in the composition of electrum, it was difficult to determine the exact worth of each coin. Widespread trading was hampered by this problem, as the intrinsic value of each electrum coin could not be easily determined. The gold content of naturally occurring electrum in modern Western

ranges from 70% to 90%, in contrast to the 45–55% of gold in electrum used in ancient Lydian coinage of the same geographical area. This suggests that one reason for the invention of coinage in that area was to increase the profits from

seigniorage Seigniorage , also spelled seignorage or seigneurage (from the Old French ''seigneuriage'', "right of the lord (''seigneur'') to mint money"), is the difference between the value of money and the cost to produce and distribute it. The term can be ...

by issuing currency with a lower gold content than the commonly circulating metal. (See also

debasement A debasement of coinage is the practice of lowering the intrinsic value of coins, especially when used in connection with commodity money, such as gold or silver coins. A coin is said to be debased if the quantity of gold, silver, copper or nick ...

). These difficulties were eliminated circa 570 BC when the

Croeseid The Croeseid, anciently ''Kroiseioi stateres'', was a type of coin, either in gold or silver, which was minted in Sardis by the king of Lydia Croesus (561–546 BC) from around 550 BC. Croesus is credited with issuing the first true gold coins wi ...

s, coins of pure gold and silver, were introduced. However, electrum currency remained common until approximately 350 BC. The simplest reason for this was that, because of the gold content, one 14.1 gram stater was worth as much as ten 14.1 gram silver pieces. File:Ephesos 620-600 BC FANEOS.jpg, Electrum coin from Ephesus, 620–600 BC File:Electrum trite, Alyattes II, Lydia, 610-560 BC.jpg, Electrum trite of

Alyattes of Lydia Alyattes (Lydian language: ; grc, Ἀλυάττης ; reigned c. 635-585 BC), sometimes described as Alyattes I, was the fourth king of the Mermnad dynasty in Lydia, the son of Sadyattes, grandson of Ardys, and great-grandson of Gyges. He ...

, 610–560 BC File:MYSIA, Kyzikos. Early–mid 4th centuries BC. Portrait of Timotheos.jpg, Electrum coin from

Cyzicus Cyzicus (; grc, Κύζικος ''Kúzikos''; ota, آیدینجق, ''Aydıncıḳ'') was an ancient Greek town in Mysia in Anatolia in the current Balıkesir Province of Turkey. It was located on the shoreward side of the present Kapıdağ Peni ...

Mysia Mysia (UK , US or ; el, Μυσία; lat, Mysia; tr, Misya) was a region in the northwest of ancient Asia Minor (Anatolia, Asian part of modern Turkey). It was located on the south coast of the Sea of Marmara. It was bounded by Bithynia on th ...

, early–mid 4th century BC File:Statère en électrum de Zeugitane représentant un cheval debout.jpg, Electrum stater,

Carthage Carthage was the capital city of Ancient Carthage, on the eastern side of the Lake of Tunis in what is now Tunisia. Carthage was one of the most important trading hubs of the Ancient Mediterranean and one of the most affluent cities of the cla ...

References

External links

Electrum lion coins of the ancient Lydians (about 600 BC)

An image of the obverse of a Lydian coin made of electrum
{{Authority control Gold Coinage metals and alloys Precious metal alloys Silver Copper alloys