Azurite is a copper carbonate mineral with the chemical formula Cu₃(CO₃)₂(OH)₂. It is known for its striking deep blue color, often found in crystalline or massive forms. Azurite forms through the weathering of copper ore deposits and is often associated with malachite, another copper mineral. It has a Mohs hardness of 3.5 to 4, making it relatively soft and suitable for use in jewelry, beads, and specimens. Major sources of azurite include Morocco, Mexico, and the United States (Arizona). Azurite is often prized by collectors for its vivid color and unique crystal formations.