mineral

Azurite-Malachite with Limonite

Cu3(CO3)2(OH)2 (Azurite) / Cu2CO3(OH)2 (Malachite)

Hardness: 3.5-4.0; Color: Dark blue (azurite) mixed with vibrant green (malachite) and yellow-brown (limonite/goethite matrix); Luster: Vitreous to dull; Crystal structure: Monoclinic; Cleavage: Fair to poor.

Hardness: 3
Luster: Vitreous to dull

Identified March 4, 2026More mineral →

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Physical properties

Formation & geological history

Formed as secondary minerals in the oxidized zones of copper ore deposits. These minerals result from the chemical weathering of primary copper sulfides like chalcopyrite in the presence of carbonate-rich waters.

Uses & applications

Used primarily in lapidary work for cabochons and beads, as a minor copper ore, and as mineral specimens for collectors. Historically used as a pigment in paints.

Geological facts

Blue azurite is chemically unstable in open air and often pseudomorphs (replaces mineral chemistry while keeping shape) into green malachite over geological time, which is why they are frequently found together.

Field identification & locations

Identify by the distinctive 'royal blue' and 'forest green' color combination and its reaction (fizzing) to cold dilute hydrochloric acid. It is commonly found in copper-rich regions of Arizona (USA), Morocco, and the Congo.

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