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Re: Brief look at pallasites.
Frank Stroik wrote:
>
> Pallasite meteorites are beautiful to say the least. They are
> spectacular to look at when cut and polished, and make great center
> piece. However little is written about them which makes it difficult to
> appreciate them completely. I am writing just a list of characters to
> think about, and will try to elaborate on each one later.
>
> Pallasite properties, and characteristics:
> 1. There are two types of Pallasites: Main Group, and Eagle Station
> trio.
> 2. Recently a new type was added the Pyroxene Pallasites
> 3. Main Group pallasites are related to IIIAB iron meteorites
> 4. Eagle Station trio are unmatched to any iron group.
>
> The above are relationships observed. It is unclear(at least to this
> author)if there is a true genetic implication or not. Since I am now
> just getting into this subject, I am just a uninformed as some may be on
> this list. However, I am pursuing this information in detail, and will
> provide the list with updates as I go. Helpful comments are appreciated.
>
> Reference:
> Scott, E.R.D. 1977 Pallasites- metal compositions, classification,
> and relationshhips with iron meteorites. Geochimica Et
> Cosmochimica Vol 41 p 349-360
> Frank
>
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FRANK:
Your discussion of pallasites leads me to one question that I have on
the appearance of pallasites. Why are some olivine crystals green while
others appear brown. It doesn't seem to have anything to do with the
location of the crystal as it pertains to how near it is to the outside
edge of the meteorite.
Jim
References: