Malachite needs more care around water than almost any stone in common use. Brief contact will not destroy a piece, but it should not be soaked, worn swimming, or cleaned with anything beyond a barely damp cloth.
This is one of the few cases where the standard advice genuinely applies rather than being cautionary boilerplate.
Why malachite is different
Two properties combine, and either alone would be manageable.
Malachite is very soft, between 3.5 and 4 on the Mohs scale. That is softer than a copper coin and softer than most other stones you might store it beside. Its polish scratches easily, and the polish is where its banded pattern gets its depth.
Malachite is also a copper carbonate, which means it reacts chemically in ways most gemstones do not. Acids attack it directly. That includes household acids such as vinegar and lemon juice, many cleaning products, and — over long enough exposure — perspiration.
Water on its own is not corrosive, but water carries whatever is dissolved in it, and prolonged wetting can dull the polished surface permanently.
What to avoid
Swimming pools and hot tubs, where chlorine will damage both stone and setting.
Showers and baths, where soap and prolonged wetting dull the surface.
Any acid: vinegar, citrus, cleaning products, descalers.
Ultrasonic and steam cleaners, which can crack malachite outright.
Storage beside harder stones, which will scratch it.
How to clean malachite
A soft, dry cloth after wearing, and nothing more in most cases.
If it needs more, use a cloth barely dampened with plain water, wipe gently, and dry immediately. Do not use soap if you can avoid it, do not soak, and do not use any proprietary jewellery cleaner.
Put jewellery on after perfume and lotion, and take it off before cleaning the house or exercising.
Is malachite toxic?
This question comes up constantly and deserves a clear answer.
Polished malachite jewellery is safe to wear. The copper is chemically bound within the mineral and does not transfer through skin contact.
The genuine hazard relates to dust from cutting, grinding or polishing raw malachite, which should not be inhaled. That is a concern for lapidaries working with the raw material, not for someone wearing a finished pendant.
The sensible precautions for a wearer are ordinary ones: do not put it in your mouth, wash your hands after handling a raw unpolished specimen, and keep it away from acids, which is advice about protecting the stone rather than protecting yourself.
Frequently asked questions
Can I shower with malachite jewellery on?
Better not to. Soap and prolonged wetting dull the polished surface, and repeated exposure will gradually flatten the banding that makes malachite worth wearing.
Is malachite safe to wear against skin?
Yes. Polished malachite in finished jewellery is safe. The copper is chemically bound in the mineral and does not transfer through skin contact. The recognised hazard is inhaling dust produced when cutting or polishing raw material, which does not apply to wearing a finished piece.
Why has my malachite gone dull?
Most often the polish has been affected by contact with acid, perspiration, soap or cleaning products. Unlike surface film on harder stones, this cannot always be cleaned away, though a jeweller can sometimes re-polish the piece.
Can malachite be repaired if scratched?
Often, yes. Because it is soft, a jeweller can usually re-polish minor surface scratches. The same softness that makes it vulnerable makes it straightforward to restore.
Which jewellery is malachite best suited to?
Earrings and pendants, where it is protected from knocks and from contact with hands. Rings and bracelets expose a soft stone to far more wear than it can comfortably take.
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