mineral
Azurite and Malachite
Cu3(CO3)2(OH)2 (Azurite) and Cu2(CO3)(OH)2 (Malachite)
Hardness: 3.5 to 4. Colors: Deep azure blue (Azurite), Bright green (Malachite). Luster: Vitreous to dull. Crystal structure: Monoclinic. Cleavage: Perfect to fair.
- Hardness
- 3
- Luster
- Vitreous to dull
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Physical properties
Hardness: 3.5 to 4. Colors: Deep azure blue (Azurite), Bright green (Malachite). Luster: Vitreous to dull. Crystal structure: Monoclinic. Cleavage: Perfect to fair.
Formation & geological history
Formed as secondary minerals in the oxidized zones of copper ore deposits. They occur when carbonated water reacts with copper-bearing rocks or minerals. Often found in limestone environments.
Uses & applications
Primarily used as decorative stones, gemstones, and mineral specimens for collectors. Historically used as pigments in paints and an ore for copper extraction.
Geological facts
Azurite is unstable compared to malachite and often pseudomorphs into it over geological time, which is why they are frequently found together. They were used by ancient Egyptians as eyeshadow and wall paint.
Field identification & locations
Identify by the distinctive blue and green color pairing and its reaction with dilute hydrochloric acid (effervescence). Commonly found in Arizona (USA), Morocco, Namibia, and the Democratic Republic of the Congo.
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