Covellite is a rare mineral primarily composed of copper sulfide, with the chemical formula CuS. It typically appears in a deep blue to violet color and has a metallic luster. Covellite is often found in hydrothermal veins and is associated with other copper minerals, such as chalcopyrite and bornite. This mineral is notable for its unique crystal structure, which can form thin, tabular crystals or massive aggregates. Covellite is primarily mined for its copper content and is sometimes used as a collector's item due to its striking appearance and rarity.