[meteorite-list] Conception Junction

From: Dave Gheesling <dave_at_meteoritecentral.com>
Date: Fri, 26 Aug 2011 18:08:18 -0400
Message-ID: <28C2C3B94D38444B99A5E8D44FA4FBDE_at_meteorroom>

Bernd, Michael G., & All,
 
I see that Robert got a draft of this note out earlier, but I've added a
little more detail here as well. Michael M. hit on part of this in his
post, but you raised a reasonable question that we're happy to address.
 
Obviously we had concerns about specimen transport prior to acquiring the
meteorite in Conception Junction -- not because the landowner wasn't
credible, but rather because it was possible a the stone was transported by
a native American, perhaps centuries ago.
 
It's hard in photographs to notice this at first due to a lack of
perspective (even with a scale cube), but the average crystal diameter of
Brenham specimens we used for comparison was about 7.5 millimeters, whereas
Conception Junction crystals average only about 4.5 millimeters -- among the
smallest of all known pallasites. It's painfully obvious in a direct
comparison that the two are quite different based on physical
characteristics alone (for several reasons, not just crystal size, including
crystal aesthetics and the relatively unique exterior).
 
Then of course there are the findings of UCLA's Dr. John Wasson, the world's
authority on iron and pallasitic meteorites, which are detailed in the
monograph through his contribution to same. To summarize, he wrote (as
Michael M. noted), "The information I report here shows there is no main
group pallasite that is closely related to Conception Junction. Conception
Junction is unique." He had several other points to make as well,
including, "In summary, the composition of the metal in Conception Junction
differs from all other known pallasites."

Apologies for the bit of redundancy included in this post, but hope it
helps...
 
All the best,
 
Dave

-----Original Message-----
From: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of Bernd V.
Pauli
Sent: Friday, August 26, 2011 1:49 PM
To: meteorite-list at meteoritecentral.com
Subject: [meteorite-list] Conception Junction

MichaelG. wrote:

"In all seriousness, it is an attractive pallasite.
 At first glance, it has a passing resemblance to Brenham."

In all seriousness: not only at first glance does it look like Brenham. It
does look suspiciously like Brenham.

Maybe it is a transported Brenham mass!

Cheers,

Bernd


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Received on Fri 26 Aug 2011 06:08:18 PM PDT