Vilnius | |
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State | |
Country | |
Capital | |
Population | 526356 |
Vilnius (Lithuanian pronunciation: [ˈvʲɪlʲnʲʊs] (listen), see also other names) is the capital of Lithuania and its largest city, with a population of 587,581 as of 2019. The population of Vilnius's functional urban area, which stretches beyond the city limits, is estimated at 706,832 (as of 2019), while according to the Vilnius territorial health insurance fund, there were 732,421 permanent inhabitants as of October 2020 in Vilnius city and Vilnius district municipalities combined. Vilnius is in southeastern Lithuania and is the second-largest city in the Baltic states. It is the seat of Lithuania's national government and the Vilnius District Municipality.
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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