Linarite is a mineral that belongs to the copper sulfate group, specifically the chemical compound copper(II) sulfate hydroxide. It is named after the type locality, the Linares region in Spain, where it was first discovered. Linarite typically occurs as a secondary mineral in the oxidation zone of copper ore deposits.
Physically, linarite is known to crystallize in the orthorhombic system, forming prismatic or tabular crystals that can be transparent to translucent. Its color is commonly deep blue, sometimes with a tinge of green or gray. Linarite has a vitreous to adamantine luster and displays perfect cleavage on two planes. It has a relatively high hardness, usually ranging from 2.5 to 3 on the Mohs scale, making it relatively resistant to scratching.
Chemically, linarite contains copper, sulfur, oxygen, and hydrogen atoms, with the chemical formula CuSO4(OH)2. It forms as a result of the weathering and alteration of primary copper sulfide minerals. Linarite is often found associated with other secondary copper minerals, such as malachite, azurite, and chrysocolla.
Due to its striking blue color, linarite is a popular mineral among collectors. However, it is considered relatively rare and is mainly obtained from several global localities, including Spain, Germany, the United States, Namibia, and Chile. Its unique hue, crystal habit, and association with other copper minerals make linarite an attractive specimen for both aesthetic and scientific purposes.
