Azurite
Chemical Formula	Cu3(CO3)2(OH)2
Species	Carbonates
Crystal System	Monoclinic
Mohs Scale	3-4
Specific Gravity	3.773-3.78
Color	Azure-blue, Berlin blue, very dark to pale blue; pale blue in transmitted light
Streak	Light Blue
Luster	Vitreous
Refractive Index	n = 1.730 n = 1.758 n = 1.838
Diaphaneity	Transparent, Translucent
Cleavage	PerfectPerfect on ; on fair; on in traces.
Fracture	Conchoidal
Crystal Habit：Massive, prismatic, stalactitic, tabular
Geological Setting：Found largely in the oxidized portions of copper deposits, it is a secondary mineral formed by the action of carbonated water acting on copper-containing minerals, or from Cu-containing solutions, such as CuSO^4 or CuCl^2 reacting with limestones.