Lavrion District Mines, Lavreotiki, East Attica, Attica, Greece

Cu₃(CO₃)₂(OH)₂

Crystal System: monoclinic
Colour: azure blue, blue, light blue or dark blue
Lustre: vitreous
Habitus: tabular or prismatic
Fracture: conchoidal
Cleavage: perfect - perfect on {011}; on {100} fair; on {110} less distinct.
Hardness: 3½ - 4
Density: 3.834 g/cm³ 
Origin and geological occurrence: it is formed under weathering of Cu sulfide ores in carbonatic deposits. 

Mindat link
Smorf link

Samples:

5.2 Azurite Dark blue globular aggregates formed by lamellar crystals associated with green malachite. #carbonates