RBT 04261 - Basaltic Shergottite
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Fact sheet
Description: 

Two identical pieces of basaltic shergotitte were found together in 2004  in the Roberts Massif of Antarctica. Oxygen isotopes indicate that they have a martian origin. Other isotopic techniques have produced a range of ages for the samples - 225 m.y. (Lu-Hf), 174 m.y. (Sm-Nd) and 167 m.y. (Rb-Sr).

About half the outer surface of the samples have a brown-black fusion crust. The interiors are tan-grey in colour with a sandy texture and low metal content.

The mineral assemblage is dominated by coarse-grained pyroxene (pigeonite) and olivine, with lesser abundances of augite, plagioclase feldspar (maskelynite), chromite, phosphate and sulphide. Shock melt veins and pockets are a feature of the samples.

In Place
In Time
Location description: 
Roberts Massif, Antarctica
Accuracy:
Location precision: 
Poor
Timescale:
Timescale: 
Jurassic
Ma = Millions of years ago
In Focus
Collection:
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Type:
Type: 
meteorite
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