RBT 04261 - Basaltic Shergottite
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Click the microscope button to view a thin section for this sample.

Fact sheet

RBT 04261 - Basaltic Shergottite

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.

-85.58, -176.96
Roberts Massif, Antarctica
About this collection

This collection of meteorites includes Shergottites, Nakhlites and Chassignites (or SNC meteorites) which originate from the surface of the planet Mars.

They carry unique signals of the surface of the planet that allows scientists to study the composition and age of Martian rocks. The collection includes a sample of the famous ALH84001 meteorite, evidence from which was used in 1996 to begin the debate of 'life on Mars?'. 


Sample details

Collection: Martian Meteorites
basaltic shergottite
Rock-forming mineral
Category guide  
Category Guide
Refers to any word or phrase that appears in the individual rock names. Names are generally descriptive; they allow users to search for broad terms like ‘granite’ as well as more specific names such as ‘breccia’. However, the adjacent descriptions of the specimens captures a wider range of general words and phrases and is a more powerful search tool.
Refers to any word or phrase that appears anywhere in the descriptions of the specimens
Accessory minerals
Minerals that occur in very low abundance in a rock. They are usually not visible with the naked eye and contribute perhapssver, they often dominate the rare elements such as platinum group metals.
Rock-forming minerals
Minerals that make up the bulk of all rock samples and are also the ones used in rock classi?cation.
Selecting one or more period, for example 'Jurassic'.
A term used to group together related samples that are not already gathered into a single Collection. For instance, there is a ‘SW England granites’ theme that includes such rock types as granite, hydrothermal breccia, skarn and vein samples.
A general term used to label a rock sample. It is a useful way of grouping similar samples throughout a collection. Category names are often, but not exclusively, common rock names (e.g. granite, basalt, dolerite, gabbro, greisen, skarn, gneiss, amphibolite, limestone, sandstone).
The owner of the sample that appears in the collection. For example, NASA owns all the samples that appear in the Moon Rocks collection
We would like to thank the following for the use of this sample: