shergottite


Also found in: Dictionary, Wikipedia.

shergottite

[′shər·gə‚tīt]
(geology)
An achondritic stony meteorite that is composed chiefly of pigeonite and maskelynite.
Mentioned in ?
References in periodicals archive ?
Caption: Northwest Africa (NWA) 5298 is a Martian shergottite meteorite discovered in Morocco and acquired by the Royal Ontario Museum in 2008.
Shergottites are a type of meteorite named after Shergotty, India, where the first example was recovered in 1865.
The shergottites became heavily shocked during the impact that launched them.
3 billion years old, which is the same age as when the shergottites originally crystallized.
They come in three different groups, the shergottites, the nakhlites and the chassignites.
These are the SNC (pronounced "snick") meteorites; the acronym derives from three distinct igneous meteorite groups: shergottites (basalts consisting of the minerals pyroxene and plagioclase), nakhlites (mainly pyroxene) and Chassigny (a unique meteorite dominated by the iron- and magnesium-rich silicate mineral olivine).
Second, the relative isotopic abundances of nitrogen and argon trapped within glass in some shergottites are the same as those in the Martian atmosphere as measured by Viking.
Later tests confirmed that the stone more closely resembles shergottites, nakhlites, and chassignites -- collectively called SNCs.