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 and is commonly mined in regions like Canada and Australia. Pentlandite is crucial for the production of nickel, which is used in various applications, including stainless steel manufacturing and battery production.