Short answer: malachite is a green copper carbonate mineral, famous for its bands of light and dark green. It forms where copper deposits weather near the surface, often with blue azurite. It is soft, 3.5 to 4 on the Mohs scale, and sensitive to acids and heat, so it needs gentle care. It has been mined for copper, pigment and ornament for thousands of years.
What is malachite?
Malachite is a copper carbonate hydroxide, Cu2CO3(OH)2. Copper gives it its green color. It is opaque and most often forms rounded, botryoidal masses, fibrous crusts and stalactites in cracks and cavities, where groundwater and hydrothermal fluids deposit it. Individual crystals are rare and form slender needles.
It rates 3.5 to 4 on the Mohs scale and leaves a light green streak. With a specific gravity of 3.6 to 4, it is noticeably heavy for its size.
The name comes, through Latin and Middle English, from the Greek for "mallow-green stone", after the color of mallow leaves.
Why does malachite have bands?
Malachite grows in layers, much as calcite builds up in a cave. Copper-rich water seeps into a cavity and deposits malachite on its walls a little at a time, layer over layer, in shades from pale to nearly black green. Sawn across, those layers show as agate-like bands, rings and eyes, often in concentric circles where the malachite grew around a center.
No two pieces are the same, which is why polished slabs, eggs and carvings are cut to show off the pattern.
Malachite, azurite and chrysocolla
Malachite rarely forms alone.
- Azurite is the other common copper carbonate, a deep blue mineral of the same hardness. The two often grow together, and malachite can replace azurite crystals while keeping their shape. Blue and green "azurite malachite" is a favorite collector's combination. Some of the finest azurite comes from Bisbee, Arizona.
- Chrysocolla is a blue-green copper silicate that forms in the same weathered copper zones. It is soft, 2.5 to 3.5 on the Mohs scale, unless it is mixed with silica. Malachite with chrysocolla shows green bands against turquoise blue.
Where does malachite come from?
Malachite is found wherever copper deposits weather, often in limestone, which supplies the carbonate. Large quantities were mined in the Ural Mountains of Russia, which supplied the decorative malachite of the Russian court. Today important sources include the Democratic Republic of the Congo and Zambia, along with Tsumeb in Namibia, Mexico, Australia and the southwestern United States, especially Arizona.
A long history
Malachite was mined near the Isthmus of Suez and in the Sinai as early as 4000 BC. At the Great Orme mines in Wales, people dug malachite for copper about 3,800 years ago using stone and bone tools, and it was mined and smelted for copper in the Timna Valley, in present-day Israel, for more than 3,000 years.
Ground malachite was used as a green pigment in paints from antiquity until about 1800. As a decorative stone, it reached its height in Russia, where the tsars used it to panel walls and make inlaid pieces. The Malachite Room in the Hermitage Museum in Saint Petersburg, with its huge malachite vase, is the best-known example.
What is malachite traditionally associated with?
In modern crystal traditions, malachite is associated with transformation, change and emotional growth, and it is often called a stone of protection. It is commonly linked with the heart chakra, and some lists pair it with Taurus and Scorpio.
These are traditional associations and beliefs. They are part of why people choose malachite, not properties you can measure in the mineral.
Raw, tumbled and polished malachite
Raw malachite comes as rough, rounded green masses, sometimes with velvety fibrous surfaces. Polishing reveals the bands. Most decorative malachite is cut into slabs, eggs, spheres, hearts, freeforms, beads and boxes. Because it is soft, polished pieces scratch with handling and lose their shine faster than quartz.
When cutting or sanding rough malachite, follow normal lapidary practice: work wet, so the dust stays in the water rather than the air.
Does malachite fade?
No. Malachite's green does not fade over time or with exposure to light, which is one reason it was so valued as a pigment.
Malachite jewelry
Malachite is popular in beads, pendants, earrings and inlay. It is too soft for rings that see daily wear, and it is sensitive to the acids and chemicals in perfume and cleaning products. Pendants, earrings and occasional-wear pieces suit it best.
How do you care for malachite?
- Avoid acids and harsh chemicals, including vinegar, lemon juice and household cleaners. Malachite is a carbonate: it fizzes in cold, dilute acid and dissolves readily in it.
- Keep it away from heat and sudden temperature changes.
- Do not soak it. Wipe it with a soft, damp cloth and dry it at once.
- Store it apart from harder stones, which will scratch it.
How can you tell real malachite?
- The bands should be crisp and varied, with natural irregularities and eyes. Perfectly regular, repeating stripes can point to an imitation.
- Weight: malachite is heavy. Plastic and resin imitations feel light.
- Temperature: stone feels cool to the touch. Plastic warms quickly.
- Synthetic malachite exists and is used in jewelry and small carvings. Poor synthetics have an unnatural color; better ones give themselves away because their bands and eyes lack the geometry of natural growth.
- Wax treatment is sometimes used to fill small voids and improve luster. It is a minor, common treatment.
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Frequently asked questions
Can malachite go in water?
Brief contact is fine, but do not soak it. Wipe it with a damp cloth and dry it. Above all, keep it away from acids, including vinegar and lemon juice, which dissolve it.
What is malachite traditionally associated with?
In crystal traditions it is associated with transformation, protection and emotional growth, and with the heart chakra. These are traditional meanings rather than measurable properties.
What is the difference between malachite and azurite?
Both are copper carbonates of the same hardness and often grow together. Malachite is green and azurite is deep blue. Malachite can replace azurite crystals while keeping their shape.
Why is malachite green?
Copper gives malachite its green color. The light and dark bands come from layers with different crystal sizes and densities.
Is malachite soft?
Yes. At 3.5 to 4 on the Mohs scale it is softer than glass and much softer than quartz, so it scratches easily and suits pendants and earrings more than everyday rings.
Where does malachite come from?
Malachite forms where copper deposits weather near the surface. Large quantities were once mined in Russia's Ural Mountains; today important sources include the Democratic Republic of the Congo, Zambia, Namibia, Mexico, Australia and Arizona.
Sources
- Wikipedia, Malachite: https://en.wikipedia.org/wiki/Malachite
- Wikipedia, Azurite: https://en.wikipedia.org/wiki/Azurite
- Wikipedia, Chrysocolla: https://en.wikipedia.org/wiki/Chrysocolla
- Geology.com, Malachite: https://geology.com/minerals/malachite.shtml