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Cairns | |
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State | Queensland |
Country | Australia |
Capital | |
Population | 133893 |
Postcode | 4870 |
Cairns (, locally (listen)) is a city in Queensland, Australia, on the east coast of Far North Queensland. The city is the 5th-most-populous in Queensland, and 14th in Australia.
Cairns was founded in 1876 and named after Sir William Wellington Cairns, the Governor of Queensland from 1875 to 1877. It was formed to serve miners heading for the Hodgkinson River goldfield, but declined when an easier route was discovered from Port Douglas. It later developed into a railhead and major port for exporting sugar cane, gold, minerals and agricultural products from surrounding coastal areas and the Atherton Tableland.
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.