[meteorite-list] NWA 3159 - Vesicular, plutonic eucrite with (pre-)terrestrial crystals?

[Ingo Herkstroeter]

Hi Folks!

I don't want to make something bad here, but to me it looks more like a
quartz grain (desert sand grain)! The colour and shine are not olivine
typical! I also don't think, that such a crystal will survive during a
fall (will melt out) or during desert (sand) storms....!  

Ingo   

-----Ursprüngliche Nachricht-----
Von: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] Im Auftrag von Gary
K. Foote
Gesendet: Samstag, 13. Januar 2007 15:45
An: bernd.pauli at paulinet.de; meteorite-list at meteoritecentral.com
Betreff: Re: [meteorite-list] NWA 3159 - Vesicular,plutonic eucrite with
(pre-)terrestrial crystals?

Bernd,

They are awesome photos.  I urge everyone to take a look.  They are full
size images at 
the following URLs;

http://www.meteorite-dealers.com/images/NWA3159CRYSTALx16-01.jpg

http://www.meteorite-dealers.com/images/NWA3159CRYSTALx32-01.jpg

Gary
http://www.meteorite-dealers.com

On 13 Jan 2007 at 13:59, bernd.pauli at paulinet.de wrote:

> Hello Greg, List, and Eucrite Buffs,
> 
> I recently bought Greg's last piece of NWA 3159, a 10.7-gram
individual.
> This is no.3 in my collection because there are already two
breathtaking
> cut slices clearly showing the two distinct lithologies:
> 
> 1. the black, shock-melted, vesicular areas
> 2. the "normal" brecciated eucritic areas
> 
> I was wondering if I could also find the vesicular texture in an
individual,
> and, I did find such areas. But, then, I held my breath when I also
spotted
> a beautiful crystal aggregate of...maybe olivine or pyroxene under my
micro-
> scope at 16x and 32x magnification!
> 
> Yes, I know that olivine is not usually found in eucrites but it has
been
> found in small amounts in NWA 011, in Macibini, in NWA 049, in NWA
1000, etc.
> 
> I would like to invite those who have acquired such individuals from
Greg and
> who can examine their pieces under high(er) magnifications to closely
examine
> their specimens and maybe find such crystalline aggregates. Any input
would
> be greatly appreciated!
> 
> Mount Tazerzait and Baszkówka have taught us that such crystals can
survive the
> meteorite's fiery descent through our atmosphere (if properly
shielded). But
> these crystals in my NWA 3159 individual are not really within the
meteorite's
> interior matrix but protrude from one of its vesicular cavities, in
other words,
> they may have been exposed to the atmospheric forces *IF* they should
be pre-
> terrestrial.
> 
> Would do you think? Terrestrial or pre-terrestrial (= meteoritic)? And
what are they?
> Quartz, pyroxene, olivine??? I will ask Jeff Kuyken, Mark Bostick, or
Gary (or, maybe, all
> of them ;-) to host the pictures I've taken so you can see what I am
talking about.
> 
> Best eucritic and
> crystalline wishes,
> 
> Bernd
> 
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> 



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