Cobalt is a fascinating element that holds numerous intriguing facts. From its vibrant blue hue to its essential role in various industries, cobalt has captivated scientists and enthusiasts alike.

In this article, we will explore some interesting facts about cobalt, shedding light on its properties, uses, and historical significance.

One of the most remarkable characteristics of cobalt is its striking blue color, which has been admired for centuries. This vibrant hue is often used in ceramics, glass, and pigments, adding a touch of brilliance to various artistic creations.

Additionally, cobalt is magnetic, making it a valuable component in the production of magnets and magnetic alloys.

Aside from its aesthetic appeal, cobalt plays a crucial role in numerous industries. It is a key component in the production of rechargeable batteries, such as those used in electric vehicles and portable electronic devices.

Moreover, cobalt is an essential element in the aerospace industry, as it is used in the production of superalloys that withstand high temperatures and extreme conditions.

Historically, cobalt has been associated with health benefits. In ancient times, it was believed to have healing properties and was used to treat various ailments. Today, cobalt is still utilized in the medical field, particularly in the form of cobalt-60, a radioactive isotope used in cancer treatments and sterilization processes.

Interesting Facts About Cobalt

Interesting Facts About Cobalt

The Colorful History of Cobalt

Cobalt gets its name from the German word “kobold,” meaning goblin or evil spirit, as miners believed it was a troublesome ore.

A Rare and Precious Metal

Cobalt is one of the few elements that naturally occurs in the Earth’s crust, making it a valuable and sought-after metal.

A Magnetic Personality

Cobalt is a ferromagnetic metal, meaning it is attracted to magnets and can retain its magnetism even after the magnet is removed.

Blue Blooded

Cobalt is responsible for the vibrant blue color in many pigments, including the famous cobalt blue used in ceramics and glassware.

A Sparkling Gem

Cobalt is used in the production of high-quality blue and green gemstones, such as cobalt spinel and cobaltocalcite.

A Vital Nutrient

Cobalt is an essential trace element for humans and animals, playing a crucial role in the production of vitamin B12.

Powering the Future

Cobalt is a key component in the production of rechargeable batteries, making it vital for the development of electric vehicles and renewable energy storage.

From the Stars to Earth

Cobalt is believed to have been formed during supernova explosions, making it a cosmic element that has traveled billions of years to reach our planet.

A Hidden Glow

Cobalt has the ability to fluoresce under ultraviolet light, creating a mesmerizing glow that is often used in art and decorative objects.

A Durable Ally

Cobalt alloys are incredibly strong and resistant to corrosion, making them ideal for use in aerospace and medical implants.

A Symbol of Wealth

In ancient times, cobalt was considered a symbol of wealth and power, often used to create luxurious blue pigments for the elite.

A Deadly Poison

Although essential in small amounts, cobalt can be toxic in higher concentrations, causing serious health issues such as lung and heart problems.

A Magnetic Healing

Some alternative medicine practices use cobalt magnets to alleviate pain and promote healing, although scientific evidence is limited.

A Shining Star

Cobalt is used in the production of superalloys, which are capable of withstanding extreme temperatures and pressures, making them essential for aerospace and power generation industries.

A Symbol of Strength

Cobalt has been associated with strength and resilience throughout history, often used in armor and weaponry to provide protection and durability.

A Cosmic Connection

Cobalt is found in meteorites, linking our planet to the vastness of space and reminding us of the interconnectedness of the universe.

A Musical Element

Cobalt is used in the production of high-quality musical instrument strings, providing a bright and resonant tone for musicians.

A Catalyst for Change

Cobalt compounds are widely used as catalysts in chemical reactions, speeding up the process and enabling the production of various essential products.

A Symbol of Endurance

Cobalt is often used as a symbol of endurance and long-lasting love, making it a popular choice for wedding rings and other jewelry.

Related: Interesting Facts About Magnesium

Fun Facts About Cobalt for Students and Kids

Interesting Facts About Cobalt

1. Cobalt is named after a mischievous creature from German folklore.

Legend has it that miners in Germany believed that cobalt was the work of a mischievous creature called “kobold.” This creature was said to cause trouble by contaminating the silver ore they were mining.

2. Cobalt is a key ingredient in some of our favorite blue pigments.

Ever wondered how artists create beautiful shades of blue? Cobalt is the secret ingredient in cobalt blue pigments, which have been used for centuries to create vibrant blues in paintings and ceramics.

3. Cobalt is essential for the production of rechargeable batteries.

Thanks to cobalt, we can power our smartphones, laptops, and electric cars. It is a crucial component in the lithium-ion batteries that store and release energy efficiently.

4. Cobalt is magnetic, but loses its magnetism at high temperatures.

When cobalt is in its pure form, it is magnetic. However, if you heat it up to a certain temperature, called the Curie temperature, it loses its magnetism. This property makes it useful in various applications, including magnetic alloys.

5. Cobalt is found in some types of vitamin B12.

Vitamin B12, also known as cobalamin, contains cobalt. This essential vitamin plays a crucial role in the production of red blood cells and the proper functioning of the nervous system.

6. Cobalt has been used to create beautiful blue glass for centuries.

Since ancient times, cobalt has been used to create stunning blue glassware. The addition of cobalt oxide to molten glass gives it a deep blue color, making it a favorite choice for glassmakers around the world.

7. Cobalt is a vital nutrient for some plants and animals.

While too much cobalt can be toxic, small amounts of this element are essential for the growth and development of certain plants and animals. It is particularly important for nitrogen-fixing bacteria, which help enrich the soil.

8. Cobalt has been used in traditional medicine for centuries.

In traditional medicine, cobalt compounds were used to treat various ailments, including anemia. However, it is important to note that modern medical practices have replaced these traditional uses with safer and more effective treatments.

9. Cobalt is used in the aerospace industry to make jet engines more durable.

Cobalt-based superalloys are used in the construction of jet engines. These alloys can withstand high temperatures and extreme conditions, making them ideal for ensuring the durability and performance of aircraft engines.

10. Cobalt is a byproduct of copper and nickel mining.

Most of the world’s cobalt production comes as a byproduct of mining copper and nickel. This means that cobalt is often found alongside these metals and needs to be separated during the refining process.

11. Cobalt has been used to create stunning blue pottery for centuries.

Artisans have been using cobalt oxide to create beautiful blue pottery for centuries. From delicate porcelain to sturdy stoneware, cobalt has been a favorite choice for adding vibrant blue hues to ceramic creations.

Related: Interesting Facts About Sulfur

Most Common Uses of Cobalt

1. Aerospace Industry

Cobalt is widely used in the aerospace industry due to its high strength and temperature resistance. It is used in the production of aircraft engines, gas turbines, and other components that require excellent performance under extreme conditions.

Cobalt-based superalloys are particularly valued for their ability to withstand high temperatures and maintain their strength, making them essential in the aerospace sector.

2. Battery Production

Cobalt plays a crucial role in the production of rechargeable batteries, especially lithium-ion batteries. It is used as a key component in the cathode material, which helps improve the battery’s energy density and overall performance.

The demand for cobalt in battery production has significantly increased with the growing popularity of electric vehicles and portable electronic devices.

3. Medical Applications

Cobalt-based alloys are extensively used in the medical field, particularly in orthopedic implants and dental prosthetics. These alloys provide excellent biocompatibility, corrosion resistance, and strength, making them suitable for long-term implantation in the human body.

Cobalt-chromium alloys, for example, are commonly used in hip and knee replacements, ensuring durability and stability.

4. Industrial Catalysts

Cobalt compounds are widely employed as catalysts in various industrial processes. For instance, cobalt catalysts are used in the production of petroleum and chemicals, such as the hydrogenation of oils and the synthesis of ammonia.

These catalysts enhance the efficiency and speed of chemical reactions, enabling the production of essential products in large quantities.

5. Pigments and Dyes

Cobalt compounds are utilized in the production of vibrant blue pigments and dyes. Cobalt blue, a popular pigment, is used in ceramics, glass, and paints to create intense blue hues.

Additionally, cobalt-based dyes are employed in the textile industry to dye fabrics, providing a range of blue shades.

6. Magnetic Materials

Cobalt is a key component in the production of magnetic materials, such as magnets and magnetic recording media. Cobalt alloys, including cobalt-iron and cobalt-platinum, are used to create strong permanent magnets with high magnetic energy.

These magnets find applications in various industries, including electronics, automotive, and renewable energy.

7. Nuclear Industry

Cobalt-60, a radioactive isotope of cobalt, is widely used in the nuclear industry for various purposes. It is utilized in medical radiation therapy to treat cancer, as well as in industrial radiography to inspect welds and detect flaws in metal structures.

Cobalt-60 is also employed in sterilization processes for medical equipment and food preservation.

Chemistry of Cobalt


Cobalt, a chemical element with the symbol Co and atomic number 27, was discovered by the Swedish chemist Georg Brandt in 1735.

Brandt was conducting experiments on a dark blue pigment found in copper ore, which he named “cobalt” after the German word “kobold,” meaning goblin or evil spirit.

He successfully isolated cobalt metal by reducing the cobalt oxide with charcoal. This discovery marked the beginning of the study of cobalt’s chemistry and its subsequent applications in various fields.


Throughout history, cobalt has been used for its vibrant blue color in glassmaking and ceramics. The ancient Egyptians were known to use cobalt compounds to create blue glazes for pottery. In the 19th century, cobalt became an essential component in the production of blue pigments for artists, such as cobalt blue and cobalt violet.

Additionally, cobalt salts were used in the textile industry to dye fabrics. Over time, the understanding of cobalt’s chemistry expanded, leading to its use in various industrial applications.

Basic Chemistry

Cobalt is a transition metal that belongs to the same group as iron and nickel in the periodic table. It has a silvery-gray appearance and is relatively hard.

Cobalt has a high melting point and is resistant to corrosion, making it useful in alloys and high-temperature applications.

It forms compounds in various oxidation states, with the most common being +2 and +3. Cobalt compounds often exhibit vibrant colors, ranging from blue to pink, due to their ability to absorb and emit specific wavelengths of light.


Cobalt’s unique properties and chemistry make it valuable in numerous applications. One of the most significant uses of cobalt is in the production of rechargeable batteries, particularly lithium-ion batteries.

Cobalt compounds are used as cathode materials, allowing for high energy density and longer battery life. Cobalt is also used in the aerospace industry, where its alloys are employed in the production of turbine blades and other high-stress components.

Additionally, cobalt-based catalysts are utilized in the petrochemical industry for various chemical reactions.

Health and Environmental Considerations

While cobalt is an essential trace element for humans and animals, excessive exposure to cobalt compounds can be harmful.

Cobalt poisoning can occur through inhalation, ingestion, or skin contact, leading to respiratory issues, heart problems, and dermatitis.

Furthermore, cobalt mining and processing can have environmental impacts, as it may result in the release of toxic compounds into the air, water, and soil.

Proper safety measures and regulations are necessary to mitigate these risks and ensure the responsible use of cobalt in various industries.

Interesting Physical Properties of Cobalt

1. Magnetic Properties

Cobalt is a ferromagnetic metal, meaning it is strongly attracted to magnets. It has a high magnetic permeability, making it useful in the production of magnetic alloys and magnets.

Cobalt-based magnets, such as Alnico and Samarium Cobalt, are known for their high coercivity and resistance to demagnetization, making them ideal for applications in motors, generators, and magnetic storage devices.

2. High Melting Point

Cobalt has a high melting point of 1,495 degrees Celsius (2,723 degrees Fahrenheit). This property makes it suitable for applications that require materials to withstand high temperatures, such as in gas turbines, jet engines, and cutting tools.

Its ability to retain its strength and structural integrity at elevated temperatures makes cobalt a valuable metal in various industrial processes.

3. Ductility

Cobalt exhibits good ductility, meaning it can be drawn into thin wires or hammered into thin sheets without breaking. This property makes it useful in the production of electrical wires, as well as in the manufacturing of various components that require shaping or forming, such as jewelry and musical instruments.

4. Hardness

Cobalt is a relatively hard metal, ranking between 5.5 and 6.5 on the Mohs scale of mineral hardness. Its hardness, combined with its resistance to corrosion, makes it suitable for use in the production of cutting tools, drill bits, and wear-resistant coatings.

Cobalt alloys, such as Stellite, are known for their exceptional hardness and wear resistance, making them valuable in applications where durability is crucial.

5. Blue Color

Cobalt is renowned for its vibrant blue color, which is often used in pigments and dyes. Cobalt blue pigments have been used for centuries in ceramics, glass, and paintings.

The unique color of cobalt compounds, such as cobalt aluminate and cobalt phosphate, adds aesthetic value to various artistic and decorative applications.