PbS, or lead(II) sulfide, is a chemical compound made up of lead and sulfur. It appears as a black solid and is primarily used in the production of lead-acid batteries and as a semiconductor material in electronic devices. Its unique properties make it valuable in various industrial applications. In nature, PbS occurs as the mineral galena, which is the main ore of lead. This mineral is often found in hydrothermal veins and sedimentary rocks. Due to its high density and metallic luster, galena is easily recognizable and has been mined for thousands of years for lead extraction.