Nickeline, also known as niccolite, is a mineral that consists of nickel arsenide. It features a metallic silver-white color and a cubical crystal structure. At times, it is used as an ore for nickel but mainly used for its ornamental purpose. There are several synonyms for nickeline such as niccolite, nickeen, nickeliferous, and nickel bloom. In terms of its association with metallic minerals, nickeline can be related to minerals like cobaltite, chalcopyrite, and pyrrhotite. Although not commonly known, nickeline is a unique mineral that is appreciated for its lustrous appearance and unique chemical composition. Therefore, with its synonyms and related minerals, nickeline offers fascinating insights into the world of rocks and minerals.