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Journal

No. 50 - November 2006

Let there be rock - addendum

Since writing the main part of this article I have had several more emails from Rob Elliott concerning Hambleton.

A further visit to The Open University was arranged where Rob met Profs. Monica Grady and Robert Hutchison with a view to more use of the SEM. Having Hambleton analysed by two generations of "Catalogue of Meteorites" authors was an event in itself! Hambleton continued to give very strange results, in particular some bizarre nickel rich areas, namely Ni 50 %, Fe 25 %, and S 25 %. Neither the OU nor the NMH can think of any mineral with this composition. Old data references are being studied but so far no similar mineral has been found. The 2:1:1 ratio is repeatable in regions right across the sample so they are leaning strongly towards the discovery of a new mineral.

Another slice has been cut from one of the highly weathered olivine rich areas. The professors seem to think this is another oddity worth sampling.

SEM at the Open University
From the left - Prof. Robert Hutchison, Dr. Diane Johnson, Prof. Monica Grady and Rob Elliott in front of the SEM at the Open University.

As of 18th May 2006 Rob had just received word that the Hambleton name and description/analysis has been accepted by the Met Society. Nickel in the plessitic octahedrite regions is anywhere up to 60 %, and they have high hopes that the nickel-rich FeS is a new mineral, although it still needs more study. In the abstracts, Hambleton is described as "a rare FeS-rich pallasite", with only one known other that shares this feature - the Phillips County (pallasite) from Colorado.

Angus Self,
May 2006,
< gus @ angusself.co.uk >

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Contents

Cover page

Presidential news

The March 29 eclipse from Libya

Let there be rock - The story of the Hambleton meteorite

Let there be rock - addendum

Brown dwarfs

About the ASE Journal


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