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**Chemical composition:** Cu₃(CO₃)₂(OH)₂
**Hardness:** 3.5
**Density:** 3.8 g/cm³
**Crystal system:** Monoclinic
**Luster:** Vitreous
**Info:** Dark blue azurite is one of the two basic copper (II) carbonate minerals, the other being bright green malachite. Azurite was used as a blue pigment since antiquity, occasionally as beads in jewellery or as ornamental stones, and also as an a good surface indicator of the presence of weathered copper sulphide ores.
## Keywords
mineral azurite texture color ornamental stone semi-precious gemstone