Chassigny (meteorite)

Chassigny is a Martian meteorite classified as a unique type of olivine-rich shergottite. It is named after the village of Chassigny, France, where it fell on October 3, 1815. Unlike most other Martian meteorites (the SNC meteorites), which are primarily basaltic in composition, Chassigny is significantly different. Its mineralogy is dominated by olivine, with less abundant pyroxene and plagioclase. This unusual composition suggests a different petrogenetic history than other SNC meteorites, possibly originating from a deep-seated mantle source within Mars.

The meteorite's characteristics have provided valuable insights into the early evolution of Mars. Isotopic dating of Chassigny indicates a formation age considerably older than most other Martian meteorites. Studies of its mineral composition and isotopic ratios have contributed to our understanding of Martian mantle processes and the planet's early geological history. While a relatively small sample, Chassigny's unique properties make it a crucial piece of the puzzle in reconstructing Mars's past. Further research continues to elucidate the detailed processes involved in its formation and the broader implications for understanding Martian geology.