Malachite is a copper carbonate mineral, and this green-colored mineral crystallizes in the monoclinic crystal system, and most often forms botryoidal, fibrous, or stalagmitic masses. Individual crystals are rare but do occur as slender to acicular prisms. Pseudomorphs after more tabular or blocky azurite crystals also occur.

Category Carbonate mineral
Color: Bright green, dark green, blackish green, commonly banded in masses; green to yellowish green in transmitted light
Mohs scale hardness 3.5–4.0