Rock Identifier
Azurite and Malachite (Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2(CO3)(OH)2)) — mineral
mineral

Azurite and Malachite

Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2(CO3)(OH)2)

Hardness: 3.5 to 4.0; Color: Azurite is deep blue, Malachite is bright green; Luster: Vitreous to dull; Crystal structure: Monoclinic; Cleavage: Fair to poor, Specific gravity: 3.7 to 3.9

Hardness
3
Color
Azurite is deep blue, Malachite is bright green
Luster
Vitreous to dull
Identified More mineral →

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Physical properties

Hardness: 3.5 to 4.0; Color: Azurite is deep blue, Malachite is bright green; Luster: Vitreous to dull; Crystal structure: Monoclinic; Cleavage: Fair to poor, Specific gravity: 3.7 to 3.9

Formation & geological history

Secondary minerals formed in the oxidized zones of copper ore deposits where carbonated waters interact with copper-bearing minerals. They are often found together since azurite tends to weather into malachite over time.

Uses & applications

Used primarily as decorative gemstones, in jewelry (cabochons), and as a minor ore of copper. Historically used as ground pigment for paints.

Geological facts

Azurite was known as 'Lapis Armeenus' in ancient times. It is chemically unstable in open air compared to malachite and will eventually turn green as it hydrates.

Field identification & locations

Identify by the distinctive 'royal blue' and 'emerald green' color pairing on a stony or quartz matrix. Found commonly in arid regions like Arizona (USA), Namibia, and Morocco. Reacts/effervesces with dilute hydrochloric acid.

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