Hexahedrites

Hexahedrites are a class of meteorites characterized by their crystalline structure. They are composed primarily of metallic iron-nickel alloys, often with a significant proportion of the mineral schreibersite. The defining feature of hexahedrites is their cubic or octahedral crystal habit, which influences their macroscopic appearance and fracture patterns. This distinct crystalline structure is a result of slow cooling of the parent asteroid or planetesimal.

These meteorites are rare, making up a small percentage of all observed meteorite falls. Their rarity is partly due to their relatively fragile nature, which can lead to them disintegrating during atmospheric entry. Upon examination, hexahedrites often exhibit a pale, silvery appearance. They are known to have a lower nickel content compared to many other iron meteorites.

The study of hexahedrites provides valuable insights into the thermal history and differentiation processes of their parent bodies. Their unique mineralogy and structure offer clues about the conditions present in the early solar system. While not as commonly found as stony meteorites, hexahedrites are highly sought after by collectors and researchers due to their rarity and distinctive characteristics.