Ashgabat | |
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State | |
Country | Turkmenistan |
Capital | |
Population | 909000 |
Ashgabat (Turkmen: Aşgabat; Ашгабат, pronounced [ɑʃʁɑˈbɑt], Persian: عشق آباد; Russian: Ашхабад), formerly named Poltoratsk (Russian: Полтора́цк, IPA: [pəltɐˈratsk]) between 1919 and 1927, is the capital and the largest city of Turkmenistan. It is situated between the Karakum Desert and the Kopet Dag mountain range in Central Asia. It is also near the Iran-Turkmenistan border.
The city was founded in 1881 on the basis of an Ahal Teke tribal village, and made the capital of the Turkmen Soviet Socialist Republic in 1924.
Cobalt | |
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State | Ontario |
Country | Canada |
Capital | |
Population | 1128 |
Cobalt is a chemical element with the symbol Co and atomic number 27. Like nickel, cobalt is found in the Earth's crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.
Cobalt-based blue pigments (cobalt blue) have been used since ancient times for jewelry and paints, and to impart a distinctive blue tint to glass, but the color was later thought to be due to the known metal bismuth. Miners had long used the name kobold ore (German for goblin ore) for some of the blue-pigment-producing minerals; they were so named because they were poor in known metals, and gave poisonous arsenic-containing fumes when smelted. In 1735, such ores were found to be reducible to a new metal (the first discovered since ancient times), and this was ultimately named for the kobold.
Today, some cobalt is produced specifically from one of a number of metallic-lustered ores, such as cobaltite (CoAsS). The element is, however, more usually produced as a by-product of copper and nickel mining.
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