### element | metal:

Cobalt
* All cobalt used in industry is imported or obtained by recycling scrap metal that contains cobalt.
* Most cobalt comes from Central Africa.
* are expensive.
* brittle, hard metal, that closely resembles iron and nickel in appearance.
* by product or coproduct of the refining of other mined metals such as copper and nickel.
* can stay for years in water and soil.
* common metal that is often combined with other metals to make metal alloys.
* competes with iron for absorption.
* compound that occurs in nature.
* definite carcinogen in animals, and a suspected carcinogen in humans.
* enters the environment from natural sources and from the burning of coal and oil.
* forms an alloy with steel.
* gives rich blue or black.
* hard ferromagnetic, silver-white, hard, lustrous, brittle element.
* hard, bluish-white metal
  - brittle metal
* high performance material.
* includes atoms.
* is chemical elements
  - colour
  - essential for nutrition in many animals
* is essential to existence
  - the metabolism of all animals
  - found as a mixture of two allotropes over a wide temperature range
  - more sensitive to sulfur than iron
  - one if three naturally magnetic elements
* is one of the three metals that are ferromagnetic at room temperature
  - world's leading developers of server hardware and equipment
  - only available to a few bacteria and algae
  - pigment
  - present in meteorites
  - pronounced as KO-bolt
  - reactive with organic pigments, having a tendency to turn brown
  - stable in air and unaffected by water, but is slowly attacked by dilute acids
  - taken up by plants from the soil
  - too reactive to occur pure in the earth
  - typically more enriched in pyrite than in chalcopyrite throughout
  - used for the solution of thir business
* is, as the name implies, a very deep shade of blue.
* occurs mainly as smalite.
* produces blue for example.
* radiation source that constantly emits radiation.
* radioactive source which gives off a particular type of radiation called gamma rays.
* resides in both silicate phases and in pyrite.
* shows the typical properties of a transition metal.
* silvery metal with a bluish tint.
* silvery, bluish-white, odorless, and magnetic metal.
* stays in the air for a few days.
* stimulates many enzymes of the body and normalizes the performance of other body cells.
* strategic and critical metal used in many diverse industrial and military applications.
* tends to exist as a mixture of two allotropes over a wide temperature range.
* transition element on the periodic table
* weakly reducing metal that is protected from oxidation by a passivating oxide film.
+ Cobalt, Occurrence and preparation
  * Cobalt is too reactive to occur pure in the earth. It is found in certain minerals. It is found with copper and nickel deposits. Normally the three metals are bonded to arsenic and sulfur. It is made by reaction with the sludge from copper and nickel processing
  - Properties: Chemical elements :: Metals :: Transition metals
  * Cobalt is a transition metal. It is shiny and conducts electricity. It is magnetic. It is a hard metal. It is moderately reactive. Iron is more reactive and copper is less reactive
+ Fischer-Tropsch process, Process chemistry, Fischer-Tropsch catalysts: Chemical reactions
  * Fischer-Tropsch catalysts are famous for being very, very sensitive to adding a little bit of sulfur. A tiny amount of sulfur can mess up the reactions. Cobalt is more sensitive to sulfur than iron.

### element | metal | cobalt:

Pure cobalt
* is obtained as a by-product of refining nickel, copper and iron
  - byproduct of refining nickel, copper and iron
* steel-gray, shiny, hard metal that is insoluble in water

Common metal
* Some common metals are copper, silver, and gold.
* are magnesium, cobalt, nickel, copper, and iron.