Pentlandite is a mineral primarily composed of nickel and iron, with the chemical formula (Ni,Fe)9S8. It is the most important ore of nickel, often found in ultramafic rocks and associated with other sulfide minerals. Its metallic luster and bronze-yellow color make it easily recognizable. This mineral typically forms in high-temperature environments, such as those found in magmatic processes. Pentlandite is often mined alongside chalcopyrite and pyrrhotite, contributing significantly to the global supply of nickel, which is essential for producing stainless steel and batteries.