Why this vibrant green mineral was once feared as a copper-stealing demon

Nature · Published 3 October 2026 Swipe more like this →

In short: Malachite has captivated humanity for millennia, from ancient Egyptian funerary rites to the opulent halls of Russian tsars. Yet, this striking copper carbonate mineral holds a deceptive history. Its resemblance to other ores once tricked miners into chasing fool's gold, leading to the accidental discovery of an entirely new metal.

Named for its resemblance to the leaves of the mallow plant, malachite has been prized since at least 4000 BC. Beyond its ornamental use in vases and palace paneling, it served as a vital source of copper. Ancient miners at Britain's Great Orme site extracted nearly 1,760 tonnes of copper from the mineral using primitive stone and bone tools. The process relies on thermodynamic reactions: heating the green ore decomposes it into black copper oxide, which is then reduced to metallic copper using carbon.

The mineral's history is marked by confusion. In Germany, miners often mistook nickeline for copper ore because it weathered into a green mineral resembling malachite. When smelting attempts failed due to the extreme temperatures required for nickel, they dubbed the deceptive ore Kupfernickel, or 'copper demon.' This frustration eventually led Swedish alchemist Baron Axel Fredrik Cronstedt to isolate nickel in 1751. Today, while traditional smelting persists, hydrometallurgy—using sulfuric acid to leach copper—has become a more common, albeit environmentally sensitive, alternative.

Malachite's cultural footprint is equally vast. In ancient Egypt, the 'Field of Malachite' represented a pain-free afterlife, and the mineral was ground into pigment for funerary eye preparations. European traditions later adopted it as a talisman for sleep and protection against lightning. Whether adorning the Hermitage Museum or inspiring the names of neotropical butterflies and flower beetles, malachite remains a bridge between the raw chemistry of the earth and the human imagination.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• Why the world's largest native copper deposits are hidden in Michigan's rugged northern wilderness
• This brilliant red mineral is a hidden powerhouse behind the history of human metalwork.
• Why this brassy, golden mineral has been the world's primary copper source since antiquity.
• Azurite is the deep blue mineral that once defined the color of ancient history.
• From campfire casting to molten electrolysis, the ancient science of extracting copper continues evolving.
• Are mantle plumes the hidden engines driving Earth's most massive volcanic eruptions?
• Earth’s magnetic field is shifting, creating a massive, radiation-prone weak spot over the Atlantic.
• When the ocean retreats, does it trigger the planet's most devastating mass extinctions?
• Deep beneath the Earth, massive pools of molten rock wait for their moment to erupt.
• When the oceans reclaim the land: the mechanics of marine transgression
• The lower mantle is Earth's hidden engine, a solid rock layer that flows like liquid.
• Did a global deep freeze turn Earth into a giant, ice-covered snowball?

More in Geology · More in Nature · Latest · A–Z · All topics