Which among the following is a copper mineral?

The correct answer is option 2. azurite.

Azurite is a copper mineral, typically found in the oxidized zones of copper ore deposits. It has a deep blue color and is often associated with malachite, another copper mineral. Azurite is valued for its aesthetic qualities and is sometimes used as a gemstone or in ornamental objects.

Bauxite (option 1) is an aluminum ore, halite (option 3) is a mineral form of sodium chloride (table salt), and hematite (option 4) is an iron oxide mineral.