The group is part of the SNC martian trio and named after the meteorite seen to fall in Chassigny, France, in 1815. Its subsequent recovery led to it being one of the first meteorites to be recognized as a genuine rock from space. Chassigny resembles a terrestrial dunite – a coarse-grained, deep-seated igneous rock – and consists of ~91% Fe-rich olivine, 5% clinopyroxene, 1.7% plagioclase, 1.4% chromite, 0.3% melt inclusions, and other minerals. Cracks within Chassigny are filled with carbonate and sulfate salts that point to chemical alteration by water before its arrival on Earth. Its crystallization age of 1.36 Ga and composition suggest a close relationship with nakhlites and an origin from the same parent magma on  Mars. However, Chassigny contains noble gas values entirely different from those found in other Martian meteorites or the Martian atmosphere. If these gases came from the Martian mantle, as suspected, Chassigny must have originated within a pluton deep inside the Martian crust.

Some or all content above used with permission from J. H. Wittke.

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