[meteorite-list] Color of OC's by Staining or by Trace Elements

From: Michael Gilmer <meteoritemike_at_meteoritecentral.com>
Date: Wed, 30 Mar 2011 12:20:31 -0400
Message-ID: <AANLkTin9FfUsroBhMrVFDfH1_GCoss3B3L-vFf9zJ6T__at_mail.gmail.com>

Hi Greg and List,

Great question Greg. I'm curious to hear what the experts have to say.

Some OC's start out as white or light-grey - like some LL6 types.
That is why some LL6 meteorites are mistaken for lunars or eucrites -
because they lack chondrules and have that whitish color.

Best regards,

MikeG

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On 3/30/11, Thunder Stone <stanleygregr at hotmail.com> wrote:
>
> Hi List:
> I hope everyone is well.
> I have a question regarding the 'color' of OC's through staining by some
> mineral influx or by oxidation. It appears most fresh OC's start out as a
> light beige or tan color; then through time the metal rusts and they often
> turn yellowish, orange, or brownish - this make sense. My questions is
> this:
> What other colors can they become, blue or green? What element(s) result in
> different colors? What different weathering processes are involved?
> The reason I ask is because I have a weathered meteorite that is dark green
> in color; it looks like jade and I have not seen any like this one before.
> I have also and seen OC's with a 'black' color, what causes that?
> Thanks,
> Greg S.
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Received on Wed 30 Mar 2011 12:20:31 PM PDT