Ferrous thio-antimonite, Fe₃Sb₂S₆

Ferrous thio-antimonite, Fe₃Sb₂S₆ or 3FeS.Sb₂S₃, is obtained by precipitation from a solution of a soluble ferrous salt with a dilute solution of potassium thio-antimonite. It is readily oxidised, and always contains potassium if prepared from concentrated solutions.