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

From: Gary K. Foote <gary_at_meteoritecentral.com>
Date: Sat, 13 Jan 2007 10:20:15 -0500
Message-ID: <45A8B25F.31427.D4F2DF_at_localhost>

There is now a page online with photos, Bernd's comments and links to the larger photos.
The URL is;

http://www.meteorite-dealers.com/nwa3159eucrite-bernd.html

Gary
>
> 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 Baszk?wka 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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> > Meteorite-list at meteoritecentral.com
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> >
>
>
Received on Sat 13 Jan 2007 10:20:15 AM PST