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Azurite
Azurite is a Copper Carbonate Hydroxide, a mineral with a deep blue color, due to the presence of Copper, which is a strong coloring agent, Azurite is found in the oxidized portions of Cooper deposits, frequently associated with Malachite

Physical Characteristics

 

Color: Deep to light blue depending of size crystals
Luster: Vitreous to dull
Transparency: Transparent to opaque
Crystal System: Monoclinic
Habits: Irregular blades, radiating crusts, botryoidal, nodular and earthy masses
Fracture: Conchoideal and brittle
Cleavage: Perfect in one direction, fair in another
Hardness: 3.5 - 4
Specific Gravity: 3.7
Streak: Light blue
Other: Often pseudomorphed to Malachite
Occurrence: Mexico (Zacatecas), USA, Africa, Australia