夏夕尼陨石是在1815年10月3日早上约8:00墬落在法国上马恩夏夕尼的一颗陨石，夏夕尼陨石是依据墬落地点夏夕尼命名的，并且是火星陨石 (SNCs) 中"C"的来源。夏夕尼陨石是橄榄石的堆积岩 (纯橄榄岩)，它几乎完全由橄榄石组成，还有内部堆积的辉石、长石和氧化物。直到在西北非洲的摩洛哥发现NWA2737之前，它是唯一被知道的纯橄榄石。

夏夕尼陨石是特别重要的，因为不同于多数的火星陨石，它包含的惰性气体成分与当前的火星大气层不同。这种差异被推测为来自自然的累积 (地函衍生) 。

Chassigny is a Mars meteorite which fell on October 3, 1815, at approximately 8:00 am, in Chassigny, Haute-Marne, France. Chassigny is the meteorite for which the chassignites are named, and gives rise to the "C" in SNCs. Chassigny is an olivine cumulate rock (dunite). It consists almost entirely of olivine with intercumulous pyroxene, feldspar, and oxides. Chassigny was the only known chassignite until NWA2737 was found in the Moroccan Sahara in northwest Africa.