Properties
| Category | Carbonate mineral |
|---|---|
| Formula | Cu2CO3(OH)2 |
| Crystal system | Monoclinic |
| Color | Bright green, dark green, blackish green, with crystals deeper shades of green, even very dark to nearly black commonly banded in masses; green to yellowish green in transmitted light |
| Crystal habit | Massive, botryoidal, stalactitic, crystals are acicular to tabular prismatic |
| Cleavage | Perfect on {201} fair on {010} |
| Fracture | Subconchoidal to uneven |
| Tenacity | Brittle |
| Mohs scale hardness | 3.5–4 |
| Luster | Adamantine to vitreous; silky if fibrous; dull to earthy if massive |
| Streak | light green |
| Diaphaneity | Translucent to opaque |
| Specific gravity | 3.6–4 |
From the Wikipedia article
Malachite is a copper carbonate hydroxide mineral, with the formula Cu2CO3(OH)2. This opaque, green-banded mineral crystallizes in the monoclinic crystal system, and most often forms botryoidal, fibrous, or stalagmitic masses, in fractures and deep, underground spaces, where the water table and hydrothermal fluids provide the means for chemical precipitation. Individual crystals are rare, but occur as slender to acicular prisms. Pseudomorphs after more tabular or blocky azurite crystals also occur.
Source
Source record: crystal-compendium/malachite/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Malachite — revision id 1377726713. Text and properties from Wikipedia, licensed CC BY-SA 4.0.