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 ?
Electrum is energizing as a color with which to take heed.
Prior to the closing, Electrum Global Holdings L.P., a joint actor of Electrum, owned 250,000 common shares representing 0.85% of the common shares of the issuer.
Minerales observados Composicion de la Muestra Minerales Formula Abreviatura Electrum (Au,Ag) el Esfalerita ZnS ef Ilmenita FeTi[O.sub.3] ii Pirita Fe[S.ub.2] py Hematita Fe2[O.sub.3] hm Goethita FeO.OH gt Gangas GGs Tabla No 2.
Electrum is a silver-gold alloy known in the ancient Near East including Judea, and was used for fine artifacts and musical instruments.
In electrum samples the rims are commonly discontinuous and extremely thin (2-5 [micro]m) which suggests a very short exogenous transfer (Glushkova and Nikiforova, 2010).
There is still some online trace of the Purple Rain singer on the web though as his last two albums, Art Official Age and Plectrum Electrum are still available on Spotify.
He has named the new pygmy locust Electrotettix attenboroughi, the genus name a combination of electrum (Latin from Greek, meaning "amber") and tettix (Greek, meaning "grasshopper").
The earliest issues probably had more political than economic functions, since they were for very large denominations, and made of electrum, a naturally occurring alloy of gold and silver, which made it hard to judge their metal value.
He then delivered a mammoth hit-packed and funk-laden set that spanned chart favourites going back 36 years as well a batch of new songs from his forthcoming Plectrum Electrum album.
"The Brits wouldn't let us play so we're gonna show you what they missed", roared the man himself and the 2,000 present were most definitely the beneficiaries as the band ripped into a 15-minute version of 'Funk N Roll', thought to feature on 3rd Eye Girl's soon-to-be-released album Plectrum Electrum, before embarking on a whirlwind tour of new material and the rock great's timeless back catalogue.
Once the show began, the crowd roared its approval every time Prince took centre stage, even for his new group's song "Plectrum Electrum".
The enigmatic star flew into London on Tuesday at the start of a still-evolving string of dates in support of forthcoming album "Plectrum Electrum,'' recorded with all-female trio 3RDEYEGIRL.