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Carbonate Minerals


Malachite is hydrated copper carbonate, Cu2(CO3)(OH)2. (more below)
Copper carbonate
Photo courtesy Ra'ike via Wikimedia Commons
Malachite forms in the upper, oxidized parts of copper deposits and commonly has a botryoidal habit. The intense green color is typical of copper (although chromium, nickel and iron also account for green mineral colors). It bubbles with cold acid, showing malachite to be a carbonate.

You'll usually see malachite in rock shops and in ornamental objects, where its strong color and concentric banded structure produce a very picturesque effect. This specimen shows a more massive habit than the typical botryoidal habit that mineral collectors and carvers fancy. Malachite never forms crystals of any size.

The blue mineral azurite, Cu3(CO3)2(OH)2, commonly accompanies malachite.

Other Diagenetic Minerals

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