Azurite
ID: 41
Azurite
Chemical Formula
Cu₃(CO₃)₂(OH)₂
Hardness (Mohs)
3.5 - 4
Crystal System
Monoclinic
Streak
Light blue
Luster
Vitreous
Diaphaneity
Transparent to translucent
Color
Deep azure blue
Crystal Habit / Mode of Occurrence
Prismatic, tabular, often in radiating or rosette-like aggregates. Also occurs in massive, nodular, and stalactitic forms. Well-formed crystals are quite striking.
Fun Facts
The intense blue color of azurite is quite distinctive and has been used as a pigment in paints since ancient times. However, it can be unstable over time and may alter to green malachite.