Pyrite chemical formula for FeS, is the most common representative of sulfide minerals, because the surface is often metallic luster and easy to oxidize "fool's gold" (Fool's Gold) misnomer. Pyrite is one of the most representative crystal forms, which belongs to the icosahedron family of cubic crystal system. It is composed of 12 pentagonal faces (each face is a regular pentagon), and the vertices connect 5 faces. The overall structure of the dodecahedron (similar to the simplified version of the "truncated icosahedron" of football).

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.