Iron, Ataxites

Ataxites are a rare structural class of Iron meteorites distinguished by their very high nickel content and lack of visible Widmanstätten patterns. Formed over 4.5 billion years ago within the cores of differentiated asteroids, Ataxites crystallised under conditions that prevented the development of the large interlocking crystal structures seen in most other Iron meteorites. Their unique composition and cooling history place them in a distinct category within metallic meteorites.

Ataxites are composed primarily of iron-nickel metal, often containing more than 16 percent nickel. Because of this high nickel content, they typically display a fine-grained or featureless metallic structure when cut and etched, rather than the classic crystalline patterns seen in Octahedrites. Some specimens may show subtle banding or internal features, but these are usually much less pronounced. Their appearance is often clean, dense, and uniform, setting them apart visually from other Iron meteorites.

Studying Ataxites provides valuable insight into how composition influences crystal formation and cooling within asteroid cores. Their structure helps scientists understand the relationship between nickel content and metallic crystallisation processes. For collectors, Ataxites are highly desirable due to their rarity and distinctive characteristics. Each specimen represents a less common form of core material, offering a different perspective within Iron meteorite collections.