mineral
Acicular Azurite (indicated by deep blue, fibrous/fuzzy appearance)
Azurite (Copper Carbonate Hydroxide) - Cu3(CO3)2(OH)2
Hardness: 3.5-4.0 on Mohs scale. Color: Deep azure blue to dark navy. Luster: Vitreous to dull/earthy depending on habit. Crystal Structure: Monoclinic; often found as acicular (needle-like) or velvet radiating crusts. Specific Gravity: 3.7-3.9.
- Hardness
- 3
- Color
- Deep azure blue to dark navy
- Luster
- Vitreous to dull/earthy depending on habit
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Physical properties
Hardness: 3.5-4.0 on Mohs scale. Color: Deep azure blue to dark navy. Luster: Vitreous to dull/earthy depending on habit. Crystal Structure: Monoclinic; often found as acicular (needle-like) or velvet radiating crusts. Specific Gravity: 3.7-3.9.
Formation & geological history
Formed as a secondary mineral in the oxidized zones of copper ore deposits. It occurs when carbonated waters act on copper sulfide ores or when copper-rich solutions interact with limestone. Formations range from prehistoric to modern oxidation processes.
Uses & applications
Used historically as a blue pigment (though it can turn green over time). Today it is primarily used as a minor ore of copper, a significant semi-precious stone in jewelry (cabochons), and a highly prized specimen for mineral collectors.
Geological facts
Known as the 'Stone of Heaven,' azurite was used by Ancient Egyptians as a pigment. It is chemically unstable over geological time and often pseudomorphs (chemically replaces) into Malachite, which is why azurite and malachite are frequently found together.
Field identification & locations
Identify by its intense 'Berlin Blue' color and effervescence in cold dilute hydrochloric acid. It is commonly found in copper-rich regions like Bisbee (Arizona), Tsumeb (Namibia), and Morocco. Collectors look for the 'velvet' habit which is fragile and beautiful.
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