Silver Objective: DailyFX Silver Chart
Its symbol is Ag, from the Latin argentum, from a PIE root reconstructed as *h2er?-, "grey" or "shining".
A soft, white, lustrous transition metal, it possesses the highest electrical conductivity, thermal conductivity, and reflectivity of any metal.
The metal occurs naturally in its pure, free form (native silver), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite.
Most silver is produced as a byproduct of copper, gold, lead, and zinc refining.
Silver has long been valued as a precious metal.
More abundant than gold, silver metal has functioned in many premodern monetary systems as coinable specie, sometimes even alongside gold.
Its purity is typically measured on a per-mille basis; a 94%-pure alloy is described as "0.940 fine".
In addition, silver has numerous applications beyond currency, such as in solar panels, water filtration, jewelry and ornaments, high-value tableware and utensils (hence the term silverware), and also as an investment in the forms of coins and bullion.
Silver is used industrially in electrical contacts and conductors, in specialized mirrors, window coatings and in catalysis of chemical reactions.
Its compounds are used in photographic film and X-rays.
Dilute silver nitrate solutions and other silver compounds are used as disinfectants and microbiocides (oligodynamic effect), added to bandages and wound-dressings, catheters and other medical instruments.
Kimberlite is an igneous rock best known for sometimes containing diamonds.
It is named after the town of Kimberley in South Africa, where the discovery of an 83.5-carat (16.70 g) diamond called the Star of South Africa in 1869 spawned a diamond rush, eventually creating the Big Hole.
Kimberlite occurs in the Earth's crust in vertical structures known as kimberlite pipes as well as igneous dykes and sills.
Kimberlite pipes are the most important source of mined diamonds today.
The consensus on kimberlites is that they are formed deep within the mantle.
Formation occurs at depths between 150 and 450 kilometres (93 and 280 mi), potentially from anomalously enriched exotic mantle compositions, and they are erupted rapidly and violently, often with considerable carbon dioxide and other volatile components.
It is this depth of melting and generation which makes kimberlites prone to hosting diamond xenocrysts.
Kimberlite has attracted more attention than its relative rarity might suggest it deserves.
This is largely because it serves as a carrier of diamonds and garnet peridotite mantle xenoliths to the Earth's surface.
Its probable derivation from depths greater than any other igneous rock type, and the extreme magma composition that it reflects in terms of low silica content and high levels of incompatible trace element enrichment, make an understanding of kimberlite petrogenesis important.
In this regard, the study of kimberlite has the potential to provide information about the composition of the deep mantle and about melting processes occurring at or near the interface between the cratonic continental lithosphere and the underlying convecting asthenospheric mantle.
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This page was last updated April 30th, 2017 by kim
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