mineral

Malachite Coating on Host Rock

Malachite [Cu2CO3(OH)2]

Hardness: 3.5-4.0; Color: Bright green to dark green; Luster: Silky to earthy; Crystal structure: Monoclinic (often found as botryoidal or crusts); Cleavage: Perfect in one direction.

Hardness: 3
Color: Bright green to dark green
Luster: Silky to earthy

Identified March 29, 2026More mineral →

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Physical properties

Hardness: 3.5-4.0; Color: Bright green to dark green; Luster: Silky to earthy; Crystal structure: Monoclinic (often found as botryoidal or crusts); Cleavage: Perfect in one direction.

Formation & geological history

Formed as a secondary mineral in the oxidation zones of copper ore deposits. It occurs when carbonated water interacts with copper minerals. Common in arid environments over long geological periods.

Uses & applications

Used as an ore of copper, as a pigment for paints throughout history, and in jewelry/ornamental carvings when found in thick, banded massive forms.

Geological facts

Malachite was used as a mineral pigment in green paints from antiquity until about 1800. It is often found associated with Azurite, another copper carbonate mineral that is blue in color.

Field identification & locations

Identify by its distinctive 'copper green' color and its reaction (effervescence) to cold dilute hydrochloric acid. Commonly found in copper mining districts like Arizona, USA, or the Congo. For collectors, look for the vibrant hue against darker host rocks.

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