Rock Identifier
Copper Ore with Malachite and Chrysocolla (Cu2CO3(OH)2 (Malachite) with Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)) — mineral
mineral

Copper Ore with Malachite and Chrysocolla

Cu2CO3(OH)2 (Malachite) with Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)

Hardness: 2.5-4.5 (variable); Color: Vivid green to cyan-blue patches on a dark matrix; Luster: Vitreous to dull; Crystal structure: Monoclinic/Amorphous; Specific gravity: 2.0-4.0.

Hardness
2
Color
Vivid green to cyan-blue patches on a dark matrix
Luster
Vitreous to dull
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Physical properties

Hardness: 2.5-4.5 (variable); Color: Vivid green to cyan-blue patches on a dark matrix; Luster: Vitreous to dull; Crystal structure: Monoclinic/Amorphous; Specific gravity: 2.0-4.0.

Formation & geological history

Formed in the oxidation zones (gossans) of copper-bearing ore deposits where acidic copper-rich solutions react with carbonate rocks or silica. Often found in arid regions.

Uses & applications

Primary source for copper metal extraction. High-quality specimens are used for lapidary work (cabochons), pigment production, and mineral collecting.

Geological facts

Malachite was used as a mineral pigment in green paints from antiquity until about 1800. It is often found associated with Azurite, creating a striking green and blue contrast.

Field identification & locations

Identify in the field by the characteristic 'copper green' staining on host rock. Commonly found in Arizona (USA), Congo, and Australia. Collectors should look for botryoidal or fibrous textures within the green patches.

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