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Azurite


Mineral Properties and Uses



What is Azurite?



Azurite is a deep blue copper carbonate. It serves as a minor ore of copper. It is also a popular gem and ornamental stone because of its blue color. Azurite's low hardness limits its use as a gem and as an ornamental stone. It is often found in association with malachite in the oxidized zone above copper deposits.


Physical Properties of Azurite

Chemical Classification carbonate
Color azure blue
Streak light blue
Luster vitreous
Diaphaneity transparent to translucent
Cleavage two directions, one perfect and one poor
Mohs Hardness 3.5 to 4
Specific Gravity 3.8
Diagnostic Properties vivid blue color, effervescence in HCl, high specific gravity
Chemical Composition copper carbonate - Cu3(CO3)2(OH)2
Crystal System monoclinic
Uses minor ore of copper, gemstone, ornamental stone, pigment


Azurite pendant
Azurite and malachite from Morenci, Arizona cut as a freeform cabochon. This gemstone is approximately 27 millimeters by 23 millimeters.


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Azurite
Azurite from Tintic, Utah. Specimen is approximately 4 inches (10 centimeters) across.




Azurite malachite earrings
Azurite and malachite from Morenci, Arizona cut as freeform cabochons. Each piece is approximately 13 millimeters by 18 millimeters.


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