mineral

Azurite and Malachite on Matrix

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2

Hardness: 3.5-4.0 (Mohs scale); Color: Deep blue (Azurite) and bright green (Malachite); Luster: Vitreous to earthy; Crystal structure: Monoclinic; Cleavage: Fair to perfect; Specific gravity: 3.7-3.9

Hardness: 3
Color: Deep blue (Azurite) and bright green (Malachite)
Luster: Vitreous to earthy

Identified March 6, 2026More mineral →

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Physical properties

Formation & geological history

Formed in the oxidized zones of copper ore deposits through the weathering of primary copper minerals. Often found as crusts, botryoidal masses, or radiating crystals in limestone-hosted environments.

Uses & applications

Commonly used as a decorative stone, in lapidary work for cabochons and beads, and as a highly sought-after specimen for mineral collectors. Historically used as a pigment for blue and green paint.

Geological facts

In Ancient Egypt, these minerals were ground into eyeshadow and used for medicinal purposes. Azurite is unstable in open air compared to Malachite and will eventually pseudonymously replace it over geological time scales.

Field identification & locations

Identified in the field by the distinct vibrant 'azure' blue and 'malachite' green colors. Found in copper mining districts like Bisbee, Arizona; Katanga, Congo; and Morocco. Effervesces (bubbles) slightly when exposed to cold dilute hydrochloric acid.

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