Rock IdentifierMalachite
Key takeaways
- Malachite is a green copper carbonate with signature concentric banding.
- It's soft (3.5–4), fizzes in acid, and its dust is toxic to inhale or ingest.
- Bright, evenly patterned 'malachite' beads are sometimes pressed powder or plastic.
What it is
Malachite is a copper carbonate hydroxide that forms in the oxidized upper zones of copper deposits. Its intense green comes straight from copper. It typically grows in rounded, botryoidal masses that, when sliced, reveal gorgeous concentric light-and-dark green bands — a pattern almost no other stone mimics naturally.
How to recognize it
Look for that vivid green with swirling or bullseye banding. It's soft (Mohs 3.5–4), so a knife scratches it, and being a carbonate it fizzes in acid. It's fairly heavy and often occurs alongside blue azurite. The distinctive banding plus softness and copper-green color make it one of the easier stones to name.
Safety & fakes
Malachite contains copper, and its dust is toxic if inhaled or ingested — never sand, grind, or lick it, and wash your hands after handling raw or freshly cut pieces. Polished specimens are safe to display and handle normally. Imitations include reconstituted malachite (powder in resin) and printed plastic; unnaturally perfect, repeating patterns and a warm, light feel suggest an imposter.
