Greenockite is a rare mineral composed of cadmium sulfide (CdS). It typically appears as yellow to orange crystals and can be found in hydrothermal veins and sedimentary deposits. This mineral is often associated with other sulfide minerals and is primarily mined for its cadmium content. The name "greenockite" is derived from the town of Greenock in Scotland, where it was first discovered in the 19th century. Due to its rarity, greenockite is not commonly used in industrial applications, but it is of interest to mineral collectors and researchers studying cadmium and its properties.