LEW 88516 - Lherzolitic Shergottite
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Fact sheet
Description: 

This cumulate gabbroic rock (lherzolite) was found in 1988 in the Lewis Cliffs region of Antarctica. Isotopic techniques have dated it at 166±16 m.y. (Sm-Nd) and 183±10 m.y. (Rb-Sr). It has many similarities with another lherzolitic shergottite - ALHA 77005 and both may have been ejected from Mars at the same time.

80% of the outer surface of LEW 88516 is black fusion crust. The interior contains about 50% olivine, 35% pyroxene, 8% maskelynite (shock-melted plagioclase feldspar) and 5% glass. Grain size is 2-3 mm. Accessory amounts of ilmenite, chromite, whitlockite (Mg-rich apatite) and pyrrhotite are also present.

Glassy to partly crystalline veinlets run through the sample.

This description is based on the work of NASA scientist Charles Meyer - compiler of The Mars Meteorite Compendium

In Place
In Time
Location description: 
Lewis Cliffs region of Antarctica
Accuracy:
Location precision: 
Good
Timescale:
Timescale: 
Jurassic
Ma = Millions of years ago
In Focus
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Type:
Type: 
meteorite
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