mineral
Azurite and Malachite
Cu3(CO3)2(OH)2 (Azurite) / Cu2CO3(OH)2 (Malachite)
Hardness: 3.5-4. Color: Deep azure blue (azurite) mixed with vibrant green (malachite). Luster: Vitreous to earthy/sub-adamantine. Crystal structure: Monoclinic.
- Hardness
- 3
- Luster
- Vitreous to earthy/sub-adamantine
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Physical properties
Hardness: 3.5-4. Color: Deep azure blue (azurite) mixed with vibrant green (malachite). Luster: Vitreous to earthy/sub-adamantine. Crystal structure: Monoclinic.
Formation & geological history
Secondary mineral formed in the oxidized zones of copper ore deposits where carbonated waters react with primary copper minerals. Often found in arid regions like Arizona (USA), Morocco, Namibia, and Australia.
Uses & applications
Popular among mineral collectors and used for lapidary work, cabochons, and ornamental carvings. Historically crushed and ground to make blue and green paint pigments.
Geological facts
Over geological time, azurite naturally pseudomorphs (weather/transforms) into malachite as it absorbs water, which is why they are so commonly found growing closely together in the same rock matrix.
Field identification & locations
Easily identified by the striking combination of vibrant, royal blue azurite and rich green malachite associated with a rusty copper-bearing matrix. Both effervesce (fizz) in dilute hydrochloric acid.
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