Galena is a mineral composed primarily of lead sulfide (PbS) and is the main ore of lead. It typically appears in a metallic gray color and has a cubic crystal structure, making it easily recognizable. Galena is often found in hydrothermal veins and sedimentary rocks, and it can be associated with other minerals like sphalerite and pyrite. This mineral has been mined for thousands of years, with its use dating back to ancient civilizations for producing lead. Today, galena is still an important source of lead, which is used in batteries, radiation shielding, and various alloys. Its extraction and processing are significant in the mining industry.