Mercury
Mercury is the only metal that exists in a liquid state at room temperature.
It is obtained by roasting natural mercury sulfide (cinnabar) and separated from other metals contained in the ore (lead, zinc, tin, bismuth) through filtration, vacuum distillation, and treatment with dilute nitric acid.
Mercury is a brilliant silvery liquid, heavy (specific gravity 1359), toxic, and corrosive to precious metals. At room temperature, pure mercury does not oxidize in the air, but mercury containing impurities forms a brownish film of mercury oxide. Mercury is stored in special iron containers ("flasks").
Mercury is used for preparing amalgams (tariff item 2843 or 2851). It is used in gold and silver metallurgy, in the production of gilded and silvered items, and in the manufacture of chlorine, sodium hydroxide, mercury salts, artificial cinnabar or fulminates. It is also used in the production of mercury lamps and various physical instruments, in medicine, etc.
Source: "Explanatory Notes to the Harmonized System of Goods Nomenclature for Foreign Economic Activity of the Russian Federation (HSN FEA Russia)" (prepared by the Federal Customs Service of Russia) (Volume 1, Sections I - VI, Groups 1 - 29)