Turquoise

Mohs hardness of 5 to 6, blue to green color, waxy to subvitreous luster, triclinic crystal system, specific gravity of 2.6 to 2.9.

Formed by the weathering and oxidation of pre-existing minerals and rocks, typically in arid environments via circulating acidic groundwater reacting with copper-bearing minerals.

Extensively used as a gemstone in jewelry, inlay work, and ornamental carvings.

Turquoise is one of the world's most ancient gem materials, prized by the ancient Egyptians, Native Americans, and Persians as a protective amulet.

Identified by its distinctive robin's egg blue or greenish-blue color coupled with dark webbed matrix veins; commonly found in the southwestern USA, Iran, and China.