硫化亚铁为黑褐色六方晶体,难溶于水。可由硫和铁在高真空石英封管内共熔而得,这样制得的硫化亚铁作为化学试剂成本较高,而化学纯试剂硫化亚铁含杂质较多。化学试剂的贮存纵然密封也要和空气接触,在空气中有微量水分存在下,硫化亚铁逐渐氧化成四氧化三铁和硫,化学方程式如下:12 Ferrous sulphide is a dark brown, hexagonal crystal that is insoluble in water. It can be obtained by eutectic fusion of sulfur and iron in a high-vacuum quartz sealing tube. The ferrous sulfide thus obtained has a higher cost as a chemical reagent, and the chemically pure reagent ferrous sulfide contains more impurities. The storage of chemical reagents should be kept in contact with air even when sealed. In the presence of trace amounts of water in the air, ferrous sulfide is gradually oxidized to triiron tetroxide and sulfur. The chemical equation is as follows: 12