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Cobalt is a hard, silver-blue chemical element with the symbol Co and atomic number 27. It’s mainly known for its role in rechargeable batteries, especially lithium-ion batteries used in smartphones, laptops, and electric vehicles.

Some key facts about cobalt:

• It’s naturally found in the Earth’s crust, often alongside nickel and copper ores.

• It is magnetic and highly resistant to heat and corrosion.

• Cobalt compounds are used to create deep blue pigments in glass, ceramics, and paints.

• In industry, it’s important for superalloys used in jet engines and turbines.