About the element

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.


Key facts

Most of the targeted by-products elements are Critical Raw Materials (CRMs). CRMs combine raw materials of high importance to the EU economy and of high risk associated with their supply.

  • Symbol: Co
  • Melting point: 1,495 °C
  • Atomic number: 27
  • Atomic mass: 58.933195 u

Cobalt is used in electroplating for its attractive appearance, hardness, resistance to oxidation; it is used as a base primer coat for porcelain enamels.

More on Cobalt.