Cobalt vs Vladivostok

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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.

The copper belt in the Democratic Republic of the Congo (DRC) and Zambia yields most of the global cobalt production. World production in 2016 was 116,000 metric tons (114,000 long tons; 128,000 short tons) (according to Natural Resources Canada), and the DRC alone accounted for more than 50%.Cobalt is primarily used in lithium-ion batteries, and in the manufacture of magnetic, wear-resistant and high-strength alloys. The compounds cobalt silicate and cobalt(II) aluminate (CoAl2O4, cobalt blue) give a distinctive deep blue color to glass, ceramics, inks, paints and varnishes. Cobalt occurs naturally as only one stable isotope, cobalt-59. Cobalt-60 is a commercially important radioisotope, used as a radioactive tracer and for the production of high-energy gamma rays. Cobalt is the active center of a group of coenzymes called cobalamins. Vitamin B12, the best-known example of the type, is an essential vitamin for all animals. Cobalt in inorganic form is also a micronutrient for bacteria, algae, and fungi.

Source: Wikipedia

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Vladivostok (Russian: Владивосто́к, IPA: [vlədʲɪvɐˈstok] (listen)) is the largest city and the administrative centre of Primorsky Krai, Russia. The city is located around the Golden Horn Bay on the Pacific Ocean, covering an area of 331.16 square kilometres (127.86 square miles), with a population of 606,561 residents, up to 812,319 residents in the urban agglomeration. Vladivostok is the second-largest city in the Far Eastern Federal District, as well as the Russian Far East. The city was founded in 1860 as a Russian military outpost after the Treaty of Aigun and the Convention of Peking with the Qing dynasty. In 1872, the main Russian naval base on the Pacific Ocean was transferred to the city, and thereafter Vladivostok began to grow. After the outbreak of the Russian Revolution in 1917, Vladivostok was occupied in 1918 by foreign troops, the last of whom were not withdrawn until 1922, by that time the anti-revolutionary White Army forces in Vladivostok promptly collapsed, and Soviet power was established in the city.

After the dissolution of the Soviet Union, Vladivostok became the administrative centre of Primorsky Krai. Vladivostok is the largest Russian port on the Pacific Ocean, and the chief economic, scientific and cultural centre of the Russian Far East, as well as an important tourism centre in Russia. As the terminus of the Trans-Siberian Railway, the city was visited by over 3 million tourists in 2017. The city is the administrative centre of the Far Eastern Federal District, and is the home to the headquarters of the Pacific Fleet of the Russian Navy. For its unique geographical location, and its European culture, the city is called "Europe in Asia". Many foreign consulates and businesses have offices in Vladivostok.

Source: Wikipedia