[meteorite-list] NWA 5469 (R5 chondrite)

From: Martin Altmann <altmann_at_meteoritecentral.com>
Date: Sat, 25 Jul 2009 03:24:57 +0200
Message-ID: <002f01ca0cc6$bd09e280$177f2a59_at_name86d88d87e2>

Hello Mike, Captain, Bernd

and I have to third Bernd's comment on Mike's comment.

NWA 5469 is the best rumurutiitic stone ever found, including Antarctica.

If you check the Bulletins there exist less than a few W0 or W0/1
(for Antarctica "A") rumurutiite at all.
And all before were very small, if not to say tiny.

Rumuruti, as the single fall with 67grams.

NWA 2897, which had 23.3grams

NWA 5035 - 49.7g (not listed yet).

Maybe NWA 4545 could be also so fresh, as it's mentioned in the description,
but no weathering grade is given. Would be fine to have a photo. Mike?
Had 119grams.

LaPaz Icefield 031135 2.7grams

For the Yamatos, I'm to sleepy to look for.
Anyway in these 32 years of Antarctica only a total of 1.24kg of Rs were
found.
Another good example, why it would be lethal for science to close the
deserts.
NWA alone yielded 27.68kg (and some not published yet.)


NWA 5469 was a stone of 497grams.
Hence, if we would change to a maestoso, Michael could state - fully
justified - that for the collectors, curators, meteoriticists, who lived so
far, such slices are definitely a once in a lifetime opportunity.

Most interesting, if not a shocking experience for some of you, is that such
fresh rumurutis do have a complete different appearance than the Rs have,
we're used to know.

Rumurutis, when they fall, aren't brown, neither reddish like you know from
the colourful breccias, nor muddy black, buuuut...

Let's collect photos from the fresh ones.

>From Rumuruti, the fall, I have to steal the picture from Patrick, else I
don't know other:

http://www.pallasite.ca/meteorites/meteoriteDetails.cfm?function=large&meteo
riteNo=562&specimenNo=651


NWA 5469 now is the unbrecciated variant.
The pictures you'll find Captain's AD.


The fresh version of the more common regolith
is represented best in NWA 5035.

Bernd, do you have a photo or shall I look?

If Stefan still has a photo of NWA 2987, I'll ask him tomorrow.

Best!
Martin


(PS: for the more economically interested ones, that is for sure
200$/g-stuff).


 

-----Urspr?ngliche Nachricht-----
Von: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] Im Auftrag von
bernd.pauli at paulinet.de
Gesendet: Samstag, 25. Juli 2009 00:57
An: Meteorite-list at meteoritecentral.com
Betreff: [meteorite-list] NWA 5469 (R5 chondrite)

> I highly recommend Michael's NWA 5469 (R5). I own a larger slice and it is
> in my top 3 favorite desert meteorites. There's nothing quite like it and
> it is sooooo fresh. The slices are expertly prepared and thin.
> Cheers, Mike Bandli


Hello Mike, Cap'n Blood and List,

So glad, this list is finally back to what it is meant to be!!!

I can't help but second Mike Bandli's comment. I'm the extremely happy owner
of a 28.156 full slice of this extremely fresh Rumuruti. That's what an
R-chondrite
looks like immediately after "touch down" :-)

There's a medium- to dark gray matrix with several veinlets and it is very
sulfide-rich
(pyrrhotite). In my slice there is a 2.5 x 3.0 mm chondrule with a massive
sulfide core
measuring 1.5 x 1.4 mm) and a BO chondrule with a thick ignous rim and a
thin veneer
of sparkling sulfide - in other words: a sulfide-armored barred olivine
chondrule of sorts!

Don't miss out on this one!

My best to "this" list,

Bernd

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Received on Fri 24 Jul 2009 09:24:57 PM PDT