Galena - WikipediaGalena, also called lead glance, is the natural mineral form of lead(II) sulfide. It is the most important ore of lead and an important source of silver. Galena is one.galena lead source,Galena Mineral | Uses and Properties - Geology. lead sulfide mineral. It is the world's most important ore of lead and a significant ore of silver. . Galena is a lead sulfide mineral with a chemical composition of PbS. It is the world's primary .. within shale. It is a growing source of US supply.