Stone type - Azurite
Azurite is a common mineral from the mineral class of carbonates and nitrates. Here is some important information about it:
- Chemical formula: Cu₃(CO₃)₂(OH)₂
- Crystal system: monoclinic
- Mohs hardness: 3.5 to 4
- Color: Deep blue (also known as mountain blue, copper blue or copper glaze)
- Transparency: Transparent to opaque
- Shine: glass-like to fat-like
Use: Azurite was used more than 4500 years ago, for example as eye make-up in ancient Egypt. It usually occurs in the form of small crystals and has a characteristic, deep blue color.
