Nickel was discovered by the Swedish mineralogist and chemist Axel Fredrik Cronstedt, who in 1751 announced he had extracted an unknown metal from an ore sample taken from the cobalt mines at Los, Sweden. The element’s road from that announcement to acceptance as a genuine new metal was slow and contentious, taking more than two decades and requiring a second chemist to produce a purer sample before the scientific community was convinced. The story involves frustrated medieval miners, a devilish nickname, and a surprisingly stubborn debate about whether the metal was real at all.
The Ore the Miners Cursed
Long before Cronstedt got his hands on it, the reddish ore we now call nickeline (nickel arsenide) had a bad reputation among German miners in the Erzgebirge mountains. The ore looked enough like copper ore that miners kept trying to smelt copper from it, and it kept refusing to cooperate. They called it Kupfernickel, roughly “copper devil” or “Old Nick’s copper,” blaming mischievous mine spirits for the frustration. The name stuck, and when Cronstedt eventually pulled a new metal out of a related mineral, he shortened the insult to “nickel.” It is one of the few elements whose name traces back to a supernatural complaint rather than a place, a person, or a Greek root.
Cronstedt’s Experiments at the Los Mines
Cronstedt was already well known for his work classifying minerals by chemical composition rather than just by appearance, an approach that was still relatively new in the mid-1700s. While studying ores from the cobalt mines at Los, he collected a sample that dissolved in nitric acid to produce a green solution. He noticed that the mineral weathered to form a green substance, now identified as nickel arsenate. When he heated this substance with charcoal, he obtained a whitish metal that did not match any known element. He presented his findings in two papers published in the Transactions of the Royal Swedish Academy of Sciences in 1751 and 1754, declaring that he had found a new metal and naming it nickel after the troublesome ore.1ChemistryViews. Axel Fredrik Cronstedt
What Cronstedt actually had was not especially pure. His sample contained traces of arsenic, cobalt, copper, and iron, all of which were present in the original ore. This impurity problem would haunt him for the rest of his career, because it gave skeptics an easy objection: maybe “nickel” was not a new element at all, just a messy mixture of already-known metals.
Two Decades of Doubt
The reaction from Europe’s chemical community was largely dismissive. Many prominent chemists argued that Cronstedt’s nickel was simply an alloy or a contaminated blend of cobalt, arsenic, copper, and iron. The objection was not unreasonable given the analytical tools available at the time. Separating closely related metals from one another was extraordinarily difficult in the eighteenth century, and cobalt itself had only been identified as a distinct element a few years earlier by Georg Brandt, who was actually Cronstedt’s teacher. The idea that yet another similar-looking metal might be hiding in the same family of ores struck many researchers as unlikely.
The skepticism persisted until 1775, when the Swedish chemist Torbern Bergman managed to produce a much purer sample of nickel. Bergman’s careful work showed that the cobalt, arsenic, copper, and iron that earlier samples contained were trace contaminants, not essential components. His purified nickel behaved consistently as a single substance with its own melting point, color, and chemical reactions, meeting the criteria for a distinct element. With Bergman’s confirmation, nickel finally gained broad acceptance as the twenty-eighth element.2Chemical Engineering World. Nickel Element Properties and Information
This two-decade gap between discovery and acceptance is revealing about how chemistry worked in that era. There was no periodic table yet to suggest where a new element might fit. There were no spectroscopic techniques to fingerprint an element by its light signature. Chemists had to rely on wet chemistry, dissolving samples in acids and observing colors and precipitates, which made it genuinely hard to distinguish a new element from a stubborn impurity. Cronstedt was right, but it took someone else’s purer preparation to prove it.
Nickel Before Anyone Knew Its Name
Humans had been using nickel for thousands of years before Cronstedt identified it, though they had no idea that was what they were handling. The most dramatic examples come from meteoritic iron. Iron meteorites typically contain a substantial percentage of nickel alongside iron, and ancient peoples who fashioned tools and weapons from meteorites were unknowingly working with a nickel-iron alloy. A well-known case is the iron dagger found in Tutankhamun’s tomb, which researchers confirmed was made from meteoritic iron based on its nickel content and other trace elements.3Meteoritics & Planetary Science. The meteoritic origin of Tutankhamun’s iron dagger blade
Bronze Age and early Iron Age peoples across multiple continents used meteoritic metal for prestige objects. Because terrestrial smelting of iron did not become widespread until later, most early iron artifacts are generally assumed to have come from meteorites, which means they contained nickel as a natural component. These ancient smiths would have noticed that meteoritic iron behaved differently from the smelted iron that eventually replaced it: it was harder, more resistant to rust, and had a distinctive crystalline pattern when etched. All of those properties owe something to the nickel content, though the smiths had no framework for understanding why.
Outside of meteoritic metal, nickel also appeared in Chinese coinage alloys (known as baitong or “white copper”) centuries before Cronstedt’s discovery. These copper-nickel-zinc alloys were valued for their silvery color and durability, and they eventually made their way to Europe, where they influenced the development of cupronickel alloys still used in coins today.
What Makes Nickel Physically Distinctive
Nickel is a silvery-white metal with a slight golden tinge when freshly polished. It is hard, ductile, and one of only four elements that are ferromagnetic at room temperature, the others being iron, cobalt, and gadolinium. Its magnetism disappears at a temperature known as the Curie point, where the metal transitions from ferromagnetic to paramagnetic behavior.4Journal of Thermal Analysis and Calorimetry. Curie temperature of nickel For nickel, that transition happens around 358 °C, which is considerably lower than iron’s Curie point. This property made nickel useful in early electromagnetic research and remains relevant in certain sensor and engineering applications.
Nickel’s most commercially important physical trait, though, is its corrosion resistance. It forms a thin, stable oxide layer that protects the underlying metal from further attack, similar to how chromium works. This passive layer is why nickel plating became so popular in the nineteenth century for protecting iron and steel objects, and it is why nickel remains a key ingredient in stainless steel and high-performance alloys. The metal also has a relatively high melting point of about 1,455 °C and maintains good mechanical strength at elevated temperatures, which makes it valuable for jet engine components and chemical processing equipment.
How Nickel Is Extracted Today
The gap between Cronstedt’s charcoal-reduction method and modern nickel extraction is enormous. Today, nickel comes primarily from two types of ore: sulfide deposits and laterite deposits. Sulfide ores, found in places like Sudbury, Ontario, and Norilsk, Russia, are processed through conventional smelting. The ore is crushed, concentrated by flotation, roasted to drive off sulfur, and then smelted in a furnace to produce a nickel matte, which is further refined electrolytically or through a carbonyl process to yield high-purity metal.
Laterite ores, which account for a growing share of global nickel production, require a different approach because the nickel is bound up in oxide and silicate minerals rather than sulfides. One prominent technique is high-pressure acid leaching, which uses sulfuric acid at high temperatures and pressures to dissolve the nickel. Research has shown that under optimized conditions, this method can achieve nickel recovery above 94% at temperatures around 265 °C, though efficiency drops considerably at lower temperatures.5Hydrometallurgy. High-pressure acid leaching of laterite ores: Effect of acid and solid content on Ni and Co yield under non-isothermal and isothermal conditions The high energy and acid requirements of laterite processing make it more expensive and environmentally demanding than sulfide smelting, which is one reason the industry’s shift toward laterite ores has prompted concern about the environmental footprint of nickel production.
A third route, the Mond process, is worth mentioning because of its elegance. Developed by Ludwig Mond in the 1890s, it exploits the fact that nickel reacts with carbon monoxide at modest temperatures to form nickel carbonyl, a volatile gas. The gas is then decomposed at higher temperatures to deposit pure nickel. This was one of the first industrial processes to exploit a metal’s unique gas-phase chemistry, and it produces exceptionally pure nickel. It remains in use at some refineries, though it requires careful handling because nickel carbonyl is extremely toxic.
Nickel in Stainless Steel and Superalloys
The single largest use of nickel today is as an alloying element in stainless steel. Adding nickel to a steel that already contains chromium stabilizes the austenite crystal structure, which gives the steel a combination of corrosion resistance, formability, and toughness that ferritic stainless steels cannot match. Research has shown that nickel alloying suppresses the formation of delta-ferrite, reducing localized stress concentrations and improving ductility.6steel research international. Combining Nickel Alloying and Heterostructure to Overcome the Strength‐Ductility Tradeoff in High Nitrogen Austenitic Stainless Steel In practical terms, this means the kitchen sink, the surgical instrument, and the food processing tank you encounter in daily life almost certainly owe their existence to nickel.
Beyond stainless steel, nickel is the base metal in superalloys designed for extreme environments. Nickel-based superalloys dominate the hot sections of gas turbine engines, both in aircraft and in power plants, because they maintain their strength at temperatures where most metals would soften or creep. These alloys typically contain a complex cocktail of chromium, cobalt, aluminum, titanium, and other elements alongside nickel, but it is nickel’s face-centered cubic crystal structure and high melting point that make it the ideal matrix metal for the job.
Nickel also plays a growing role in rechargeable batteries. Nickel-metal hydride batteries powered the first generation of hybrid cars, and today nickel is a critical component of the lithium-ion battery cathodes used in electric vehicles. The most common high-energy cathode chemistries, sometimes called NMC (nickel-manganese-cobalt) or NCA (nickel-cobalt-aluminum), rely on increasing nickel content to boost energy density. This battery demand is now one of the primary drivers of nickel market growth and has intensified interest in new sources of the metal.
Nickel’s Dual Nature in Biology
Nickel occupies an unusual position among metals in biology: it is both essential and hazardous, depending on concentration and context. Several bacterial enzymes require nickel to function, including urease, which breaks down urea, and certain hydrogenases involved in hydrogen metabolism. Some human pathogens actually depend on nickel-containing enzymes to colonize the body, making nickel a factor in certain infectious diseases.7PubMed. Nickel and human health
For humans, the most common health concern associated with nickel is contact allergy. Nickel allergy is among the most prevalent forms of contact dermatitis worldwide, triggered by prolonged skin contact with nickel-containing objects like jewelry, belt buckles, and coins. The allergy involves an immune response to nickel ions that penetrate the skin, and once sensitized, a person typically remains allergic for life. Regulations in the European Union have limited the amount of nickel that consumer products can release onto the skin, which has reduced sensitization rates in countries that enforced the rules early.
At higher exposures, particularly through inhalation in occupational settings, certain nickel compounds are classified as carcinogenic. Nickel refinery dust and nickel subsulfide have been linked to increased risks of lung and nasal cancers in workers. The mechanisms involve nickel ions interfering with DNA repair pathways and gene expression. This carcinogenic potential is specific to certain nickel compounds and exposure routes; handling a nickel-plated object or eating a nickel-containing food does not carry the same risk as years of breathing refinery dust.
The Deep-Sea Frontier for Nickel Supply
As demand for nickel accelerates, driven largely by the battery industry, attention has turned to sources that were once considered impractical. One of the most debated is deep-sea mining. The ocean floor, particularly in the Clarion-Clipperton Zone of the central Pacific, is littered with polymetallic nodules: potato-sized lumps that formed over millions of years and are rich in nickel, cobalt, manganese, and copper. Estimates suggest that meeting future demand could require around 10 million metric tons of nickel annually by 2050, and declining terrestrial reserves have made these nodules increasingly attractive to mining companies.8PubMed Central. Low-waste, single-step, sustainable extraction of critical metals from deep-sea polymetallic nodules
The environmental risks, however, are significant and poorly understood. Deep-sea ecosystems are slow to recover from disturbance, and the process of scooping nodules from the seafloor would destroy habitat, generate sediment plumes, and disrupt geochemical cycles that scientists are still mapping.9PubMed Central. Review and Integrated Framework for Deep-Sea Mineral Resources, Ecological Influence, and Future Development Some research groups are exploring low-waste extraction methods that could reduce the environmental footprint of processing nodules once they are brought to the surface, but the ecological impact of the harvesting itself remains a major concern. As of now, no commercial-scale deep-sea nickel mining is underway, though several companies hold exploration licenses and pilot projects are advancing. The tension between the need for battery metals and the desire to protect ocean ecosystems is one of the defining resource debates of the coming decades, and nickel sits at the center of it.
Why Nickel Coins Replaced Silver
One of the ways most people physically encounter nickel without thinking about it is through pocket change. The United States five-cent piece has been called a “nickel” since 1866, when the Shield nickel replaced earlier silver and copper small-denomination coins. The switch was partly economic: silver was expensive and fluctuated in value, while a copper-nickel alloy was cheap, durable, and easy to mint in consistent weights. Other countries followed similar logic. Today, cupronickel (typically 75% copper and 25% nickel) is the standard alloy for coins in dozens of countries. The alloy is hard enough to resist wear, takes a detailed impression from a die, and has a pleasant silvery color that the public associates with value.
An ironic consequence of nickel’s popularity in coinage is that handling coins is one of the most common sources of low-level nickel skin exposure. For the majority of people this is harmless, but for individuals with nickel allergy, daily coin handling can trigger or maintain hand dermatitis. Some countries have explored alternative alloys or coatings to reduce nickel release from coins, though changing an entire monetary system’s alloy is expensive and slow. Sweden, Cronstedt’s home country, moved some of its coins away from nickel alloys partly for this reason.
From a cursed ore that frustrated copper miners to a metal that props up everything from jet engines to electric cars, nickel’s journey through human history is remarkably broad for an element most people associate only with a five-cent coin. Cronstedt would probably be amused that the metal he struggled to get recognized now commands a global market worth tens of billions of dollars a year.