Stony-iron meteorites are a rare and visually striking class of meteorites that contain roughly equal parts silicate rock and metallic iron-nickel. They are thought to originate from the boundary zones of differentiated asteroids, where molten metal cores met and mixed with overlying rocky mantles during the early formation of the solar system. Violent collisions between these parent bodies ejected fragments into space, and over millions of years, some of this material travelled into Earth-crossing orbits. A small number survive their passage through the atmosphere, arriving on Earth as some of the most distinctive and sought-after meteorites in any collection.

Stony-iron meteorites are divided into two main groups: pallasites and mesosiderites. Pallasites are especially prized for their translucent olivine crystals (the rarer lime colours being referred to as peridot) suspended within a polished iron-nickel matrix, creating a unique gemstone-like appearance. Mesosiderites, on the other hand, are brecciated mixtures of silicate rock and metal, formed through complex impact processes that shattered and reassembled material from different layers of their parent bodies. Unlike chondrites, stony-irons are achondritic in nature, meaning they lack chondrules and instead reflect processes of melting, mixing, and differentiation.

Studying stony-iron meteorites provides valuable insight into the internal structure and evolution of early planetary bodies. These meteorites offer a rare glimpse into the core-mantle boundary, an otherwise inaccessible region, revealing how metal and silicate materials interacted during planetary differentiation. Their complex formation histories also shed light on the role of large-scale impacts in shaping the early solar system. For collectors, stony-iron meteorites represent some of the most visually captivating and scientifically important specimens available, combining natural beauty with a direct connection to the building blocks of planets.