[meteorite-list] Korra Korrabes

From: John Gwilliam <jkg_at_meteoritecentral.com>
Date: Thu Apr 22 10:27:47 2004
Message-ID: <4.2.0.58.20031112171134.009ce2a0_at_mail.theriver.com>

There are a couple of things you might not know about Korra
Korrabes. First, there are two different grades of it that were
collected. The very weathered specimens are missing much of the iron due
to weathering. Fresher and better preserved specimens have less weathering
and fracturing and more intact metal.

Second, KK is one of those meteorites that loses much of it's detail when
highly polished and viewed with the naked eye. These specimens are best
viewed under well-light magnification. To make the details of the specimen
more visible to the naked eye, hand sand the specimen with silicon carbide
paper in 220 grit or coarser range.

Selma is another meteorite that exhibits this same characteristic. When
highly polished, it looks nearly black and featureless. But, when prepared
properly it shows a lot of chondrules.

Best,

John

At 09:59 PM 11/12/03 +0000, Dave Harris wrote:
>Hi,
>
>Last night Mark Ford and I and an enjoyable evening going thru his new
>acquisitions - the one that caused the most confusion was the Korra Korrabes
>specimen - an H3.
>
>Well, we looked at it, compared it to other H3s, also to the Ghubara, and we
>found it difficult to see how this is an H3.
>
>We are obviously missing a critical issue here, because the chondrules were
>scant, and indistinct, in fact my Ghub, at an L6 had more structure visible.
> It was a very dark matrix too, whereas a lot of H3s have a light matrix (ie
>Parnallee)
>
>How and why is KK an H3 - the native iron was sparse, and the chondrules
>largely invisible.
>
>So, how come it's an H3?
>
>
>
>
>
>inquisitively,
>
>Dave
>
>IMCA #0092
>
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Received on Wed 12 Nov 2003 07:21:02 PM PST