iron sulfide can be formed by heating a mixture of powdered iron and sulfur
iron_sulfide is inorganic_compound. iron_sulfide is not inorganic_compound. alpha_iron is iron. silver_sulfide is chemical_compound. iron_disulfide is sulfide. sulfide_ion is sulfur_atom. steam_iron is iron. iron_disulfide is not sulfide. sulfide is compound. if iron occurs then heat occurs.