Troilite is a mineral composed primarily of iron sulfide (FeS). It is commonly found in meteorites, particularly in those classified as chondrites. Troilite typically appears as a metallic gray or black material and is often associated with other minerals like olivine and pyroxene. This mineral is significant in the study of planetary formation and the composition of celestial bodies. Troilite can provide insights into the conditions present during the early solar system, making it an important subject for researchers in the fields of geology and astrobiology.