The chemical formula is CdS, which is a sulfide mineral mainly composed of cadmium and sulfur. It usually appears in the form of yellow to orange crystals or powders, with a metallic luster, and is an important source for extracting cadmium. It is not common in nature and usually coexists with zinc minerals, lead minerals, and other sulfide minerals. Mainly formed in mid to low temperature hydrothermal veins or sedimentary rocks, especially in sulfate layers in sedimentary rocks. Due to the low content of cadmium in the Earth's crust, the reserves of cadmium sulfide minerals are relatively small. The industrial application of cadmium sulfide ore mainly focuses on the production of cadmium compounds. In addition, cadmium compounds are also used for control rods in batteries, electroplating, and nuclear reactors.