What is cobalt?

Cobalt is a chemical element, symbol Co, atomic number 27, and it is a hard, brittle, bluish-gray metal. It’s best known for its role in batteries, superalloys, magnets, and blue pigments.

[1][4][6]

Quick Scoop

• What it is: A transition metal found naturally only in compounds, not usually as a pure metal.
[9][1]
• Main uses: Rechargeable batteries, jet-engine alloys, magnets, cutting tools, pigments, and some medical/radiation uses.
[4][6][1]
• Why it matters: It helps materials resist heat, wear, and corrosion, which makes it valuable in high-performance technology.
[7][1]
• Health note: Cobalt is an essential trace element in vitamin B12, but large amounts can be harmful.
[1]

Where it comes from

Cobalt is usually recovered as a by-product of nickel and copper mining, and major production is associated with places like the Democratic Republic of the Congo and other mining regions. It is not typically mined as a major standalone ore in large amounts.

[6][4][1]

Common uses

• Batteries: Helps improve battery performance and energy density in rechargeable batteries.
[6][7]
• Alloys: Used in high-strength, high-temperature metals for jet engines and gas turbines.
[4][1]
• Magnets: Helps make powerful magnets when combined with other metals.
[1]
• Pigments: Produces the famous cobalt blue used in glass, ceramics, paint, and enamel.
[10][1]
• Medicine and industry: Cobalt-60 is used in cancer treatment and radiotherapy.
[1]

In one line

Cobalt is a versatile metal that’s important because it can handle heat, resist wear, and support modern tech like batteries and aerospace materials.

[7][1]