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**Chemical formula:** Cu₃(CO₃)₂(OH)₂ **Hardness:** 3.5 **Density:** 3.8 g/cm³ **Crystal system:** Monoclinic **Luster:** Vitreous **Description:** Dark blue azurite is one of two primary copper (II) carbonate minerals, the other being bright green malachite. Historically, azurite was used as a blue pigment, in jewelry as beads, and as ornamental stones. It is also an effective surface indicator for the presence of weathered copper sulfide ores. ## Keywords mineral azurite texture color ornamental stone semi-precious gemstone
