Malachite Identification Guide
A field guide to identifying Malachite, green copper carbonate, by its banding, green streak, acid fizz, and look-alikes.
Read the full Malachite encyclopedia entry →
What Malachite Looks Like
Malachite is a hydrated copper carbonate, Cu2CO3(OH)2, prized for its vivid green color and concentric banding. It is a secondary copper mineral that forms in the oxidized zones of copper deposits.
- Color: bright to dark green, almost always banded in light and dark green
- Luster: silky to velvety on fibrous/botryoidal surfaces; dull to vitreous; glassy when polished
- Transparency: opaque (translucent only in thin crystals)
- Habit: botryoidal (grape-like) masses, concentric banded nodules, fibrous crusts, and stalactitic forms
Step-by-Step Field ID Checklist
- Look for green concentric banding — alternating light/dark green rings or eyes are highly diagnostic.
- Note the botryoidal/grape-like or silky fibrous surfaces.
- Streak it on unglazed porcelain — a pale green streak.
- Apply dilute acid — malachite effervesces (fizzes) because it is a carbonate.
- Test hardness — soft, Mohs 3.5-4; a knife scratches it.
Key Diagnostic Tests
- Mohs hardness: 3.5-4.
- Streak: light/pale green — very diagnostic.
- Cleavage: perfect in one direction (rarely seen in massive material).
- Specific gravity: ~3.6-4.0, noticeably heavy for a green stone.
- Acid: effervesces in dilute HCl (carbonate).
Common Look-Alikes and How to Tell Them Apart
- Chrysocolla: blue-green but harder-feeling when silicified, does NOT fizz in acid, and lacks malachite's concentric green banding.
- Green dyed howlite/magnesite: softer, white-bodied with dye in cracks; lacks malachite's natural banding and green streak.
- Reconstituted/imitation malachite (resin): banding looks too regular or printed, lighter weight, and warms quickly in the hand; no acid fizz.
- Amazonite/green jasper: harder (6-7), no acid reaction, no banded botryoidal habit.
Where It Is Typically Found
Malachite forms in the weathered, oxidized zones of copper ore bodies, often with azurite, cuprite, and limonite. Famous sources include the Democratic Republic of the Congo, Russia (the Urals), Zambia, Australia, and the southwestern USA (Arizona).
Frequently asked questions
How can you tell if malachite is real?
Real malachite is green with concentric banding, soft (Mohs 3.5-4), heavy (SG ~3.8), gives a pale green streak, and effervesces in dilute acid. Resin imitations are light, warm quickly, and do not fizz.
Malachite vs chrysocolla - how to tell them apart?
Malachite is a carbonate that fizzes in acid and shows concentric green banding, while chrysocolla is a silicate that does not effervesce, is more blue-green, and lacks the banded botryoidal pattern.
Does malachite react with acid?
Yes. Because malachite is a copper carbonate, it effervesces (fizzes) in dilute hydrochloric acid, which helps distinguish it from copper silicates like chrysocolla.
What does real malachite look like?
It is opaque, vivid green with alternating light and dark green concentric bands, often in grape-like (botryoidal) or fibrous, silky masses that take a high polish.
Malachite identified by the community
Recent Malachite specimens identified with Rock Identifier.
