ferrous sulfide

Ferrous sulfide (FeS) is a chemical compound of iron and sulfur. It occurs naturally as the minerals pyrrhotite and troilite. It can also be produced by fusing iron and sulfur or by adding an alkaline sulfide to a solution of a ferrous compound. Ferrous sulfide is used primarily in the production of hydrogen sulfide.1

Sulfide minerals, in general, are compounds of sulfur with metals. They often have metallic luster, electrical conductivity, and can be vibrantly colored. The general formula for sulfide minerals is A_mS_n, where A represents a metal. Common metals found in sulfides include iron, copper, nickel, lead, cobalt, silver, and zinc.2