![logo](/img/xlogo_small.webp.pagespeed.ic.Rif_4bzYCq.webp)
Privacy
Cobalt | |
---|---|
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.
Valle de Mena | |
---|---|
State | |
Country | |
Capital | |
Population | 0 |
The Mena Valley (Spanish: Valle de Mena) is a municipality of the province of Burgos in Spain. It is located in the autonomous community of Castile and León, bordering the provinces of Alava, Biscay and Cantabria.
Noida, short for New Okhla Industrial Development Authority, is a planned city located in Gautam...
Lawrenceville is the name of several places: United States Lawrenceville, former name of...
Houston ( (listen) HEW-stən) is the most populous city in Texas, fourth-most populous city in...