Azurite with Malachite and Limonite

Physical Properties

Hardness: 3.5-4 (Mohs); Color: Deep azure blue (Azurite) and bright green (Malachite); Luster: Vitreous to earthy; Crystal structure: Monoclinic; Cleavage: Fair; Specific Gravity: 3.7 to 3.9

Formation & Geological History

Formed as a secondary mineral in the oxidized zones of copper ore deposits. It occurs when carbonated waters react with copper-bearing minerals. The surrounding tan/brown matrix is likely Limonite (iron oxide).

Uses & Applications

Primary use is as a collector's specimen. Historically used as a blue pigment for paints. Minor use in jewelry (cabochons) and as a minor ore of copper.

Geological Facts

Azurite is unstable in open air compared to malachite and often pseudomorphs into it over geological time, which is why they are frequently found together. It was used in Ancient Egypt as a sacred pigment.

Field Identification & Locations

Identify by the distinctive 'royal blue' color paired with green. It will effervesce (fizz) in dilute hydrochloric acid because it is a carbonate. Found in copper mining regions like Arizona (USA), Morocco, and Namibia.

Identified on: 4/21/2026

Mode: Standard