[meteorite-list] Weird inclusion in NWA 2086 CV3

From: Jeff Grossman <jgrossman_at_meteoritecentral.com>
Date: Tue, 10 Aug 2010 16:07:21 -0400
Message-ID: <4C61B179.8020007_at_usgs.gov>

My money's on terrestrial weathering as the cause of the brown area,
although there is a clear lithologic boundary on the right side of
photo:
http://i268.photobucket.com/albums/jj24/Meteoritethrower/2086-slice-weird-1.jpg.

Jeff


On 2010-08-10 2:22 PM, Galactic Stone & Ironworks wrote:
> Hi Bernd and List,
>
> That's funny you mention that because Bob King also raised the
> possibility of phyllosilicates. I took some more photos of the
> specimen that show a better representation of what the specimen looks
> like. You can also see a distinct boundary line between the typical
> NWA 2086 lithology (darker matrix) and the strange "lighter colored"
> lithology that the majority of this stone has. One area near the end
> shows the type of matrix we expect from NWA 2086.
>
> The brown inclusion does not show any features under it or through it,
> except in one small spot where two chondrules appear to be immersed in
> it, while the rest of the inclusion flows around the chondrules like a
> river flows around islands.
>
> http://i268.photobucket.com/albums/jj24/Meteoritethrower/endcut-519-a.jpg
>
> http://i268.photobucket.com/albums/jj24/Meteoritethrower/endcut-326-1.jpg
>
> http://i268.photobucket.com/albums/jj24/Meteoritethrower/2086-slice-weird-1.jpg
>
> Best regards,
>
> MikeG
>
> ------------------------------------------------------------
> Mike Gilmer - Galactic Stone& Ironworks Meteorites
> http://www.galactic-stone.com
> http://www.facebook.com/galacticstone
> ------------------------------------------------------------
>
> On 10 Aug 2010 15:21:51 UT, bernd.pauli at paulinet.de
> <bernd.pauli at paulinet.de> wrote:
>
>> http://i268.photobucket.com/albums/jj24/Meteoritethrower/2086-inclusion.jpg
>>
>> Hello All,
>>
>> Michael G. wrote:
>>
>> "So I am thinking that there must have been a surface fracture that extended
>> down into
>> the interior of the stone. Weathering products intruded through this crack
>> and the brown
>> 'inclusion' is probably just a clay-like replacement mineral."
>>
>> "clay-like" => phyllosilicates are clay minerals!
>>
>> .. and *if* it is preterrestrial, this might be an extended
>> area of phyllosilicates, saponite, smectite or something!
>>
>> Cheers,
>>
>> Bernd
>>
>>
>>
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-- 
Dr. Jeffrey N. Grossman       phone: (703) 648-6184
US Geological Survey          fax:   (703) 648-6383
954 National Center
Reston, VA 20192, USA

Received on Tue 10 Aug 2010 04:07:21 PM PDT