Shergottite

Tissint shergottite meteorite. Image Credit: SkyFall Meteorites (Mendy Ouzillou)

Igneous stony meteorite with a Martian origin consisting mainly of plagioclase (or a shocked glass of plagioclase composition) and pyroxene. They are the most abundant type of SNC meteorites and the type member is the Shergotty meteorite, which fell in India in 1865. Shergottites are igneous rocks of volcanic or hypabyssal (shallow plutonic) origin, and can easily resemble terrestrial rocks. They all have exceptionally young crystallization ages of 150-200 Ma, and usually show signs of severe shock metamorphism (typically plagioclase has been converted to maskelynite). Shock metamorphism probably occurred when the shergottites were blasted off the Martian surface during an impact event.


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


 

 

Closeup of Tissint shergottite meteorite. Image Credit: SkyFall Meteorites (Mendy Ouzillou)