[meteorite-list] Classification of Chondrites

From: Martin Horejsi <martinh_at_meteoritecentral.com>
Date: Thu Apr 22 09:50:24 2004
Message-ID: <B8D6F52A.2A75%martinh_at_isu.edu>

Hi Michael and all,

On page 88 of Norton's new book (CEoM) there is an excellent color
photograph of a Cole Creek thin section that when compared to the other
three images on the page, two type three images and a type 6 image, makes it
clear that while Cole Creek does have many chondrules, they are not of the
clarity of the lower numbers because the chondrules have gone through some
recrystalization and are not as clearly defined when compared to lower
numbers.

But you should know all this by now because it appears, in the fine print
anyway, that you provided the Cole Creek thin section to Mr. Norton in the
first place!

Cheers,

Martin







On 4/7/02 7:01 PM, "Michael Blood" <mlblood_at_cox.net> wrote:

> Bernd Pauli HD wrote:
> .........
>> Slight correction: Cole Creek is an H5 chondrite. So far,
>> so good (or bad). We discussed this about 18 months ago
>> and when I got my Cole Creek thin section from Michael
>> Blood, I got almost drowned in a sea of chondrules. But it
>> does have a fayalite content (another important parameter)
>> of 18.5 and this makes it clearly an H chondrite although
>> not necessarily an H5 chondrite :-(
> ........
>> Best wishes,
>> Bernd
>> ______________________________________________
> Hi Bernd, Fred & all,
> It has always amazed me that Cole Creek is classified as a
> 5. I understand the "H" classification - but not the "5" - can
> you, Bernd, or, anyone, tell us why a meteorite with such
> clearly distinct and well defined (as well as colorful) chondrules
> can be a "5?" (I REALLY wanna know...)
> Thanks, Michael
>
>
>
Received on Mon 08 Apr 2002 09:20:11 AM PDT