Electrum


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electrum

[i′lek·trəm]
(metallurgy)
A naturally occurring alloy of gold and silver.

Electrum

 

a mineral, a type of native gold with a silver content above 25–50 percent.

Electrum, which contains admixtures of tellurium, copper, antimony, and mercury, is characterized by nonuniform distribution (zonality, decomposition structures of high-silver solid solutions of gold). It crystallizes in the isometric system. It rarely occurs in the form of crystals, usually being encountered in the form of flat dendrites, ranging in area from fractions of 1 mm2 to 10–20 mm2 (sometimes reaching 30–50 mm2), or in the form of irregular microscopic particles. Electrum nuggets weighing as much as 400 g have been found. The color ranges from gold yellow to light yellow, depending on the silver content. The hardness on Mohs’ scale is 2–3, and the density ranges from 1,500 to 1,650 kg/m3.

Electrum, a relatively rare mineral, is encountered in hydro-thermal deposits and quartz and chalcedony-quartz veins in association with carbonates, adularias, sulfides, tellurides, and sulfo salts of silver, lead, and antimony. The smallest inclusion of electrum establishes the gold content of copper pyrite and complex ores. Electrum is a component of gold ores.

REFERENCE

Petrovskaia, N. V. Samorodnoe zoloto. Moscow, 1973.

electrum

A natural alloy of gold and silver, sometimes employed in the decorations of ancient temples and palaces.
References in periodicals archive ?
To date, Electrum has a portfolio comprising over 100 projects located across 16 countries in the Americas, Africa, Asia and Eastern Europe.
Thurnham Investments, owned by Mr Jones and his senior colleagues, has since restructured Electrum Services to develop and grow the company further.
Changing states, touched by the divine, these bodies achieve the ultimate union of body and soul--an electrum where both elements are equally pure and will stay that way forever.
As the work of Simmel and Shell points out, to emphasize this concrete, physical dimension of money is to emphasize what is at odds with the very nature of money, which is always undergoing what Simmel calls a continual process of "spiritualization," moving, in Shell's phrase, from "the electrum money of ancient Lydia" to "the electric money of contemporary America" (Poggi 161, Shell 1).
The Universal Electric Vehicle Corp has released its Electrum Spyder.
This paper underlines the mineralogical characteristics of these deposits by pyrite presence as the main mineral, either disseminated or as sulphur; the absence of arsenopyrite and the occurrence of a variety of minerals such as gold, silver, lead, bismuth and nickel of the telluride's group: Petzite, Calaverite, Silvanite, Hessite, Bolinskite, Shtiutzite, Melonite, and altaite, as well as the presence of gold of high purity and electrum (Torres et al.
The quest for even greater convenience continued, and between 640 and 630 BCE the Lydians, a people native to Asia Minor, literally coined the first modern form of money by fashioning embossed metal disks from electrum, an alloy of gold and silver.
Made from a mixture of silver and gold ( known as electrum ( the chain, or torc, is around 2,000 years old and extremely rare.
The world famous 4,500-year-old Sumerian collection includes the Ram-in-the-Thicket, the Great Lyre with a gold and lapis lazuli bull's head, Lady Puabi's lapis lazuli and carnelian jewelry, an electrum drinking tumbler, and a gold ostrich egg as well as Lady Puabi's headdress and other treasures.
There was another wide-margin success in the final race of the day when Electrum, trained by John Hayden and ridden by Jamie Spencer, opened his account by sprinting clear in the final furlong to beat Tiger Royal and the strong-finishing Brigade Charge by nine lengths and a head in the John Dunton Race.
00: PEACE UPHOLDS (N G McCullagh, 9-2) 1; Inourhearts (10-1) 2; Electrum (6-1) 3.
Gold occurs as mostly electrum and to a lesser extent bogdanovite.