Antimonite is a mineral composed primarily of antimony sulfide, with the chemical formula Sb2S3. It typically appears as a gray to black, metallic-looking substance and is often found in hydrothermal veins. Antimonite is an important source of antimony, which is used in various applications, including flame retardants and lead-acid batteries. This mineral can be identified by its distinct crystal structure, often forming prismatic or tabular crystals. Antimonite is commonly associated with other minerals such as galena and pyrite. Due to its properties, it is of interest in both geology and industrial applications.