[meteorite-list] Question on Toluca Sample that I came acrosson ebay

From: Mark Grossman <markig_at_meteoritecentral.com>
Date: Tue, 4 Aug 2009 21:30:29 -0400
Message-ID: <C0BA1AC5440E4AFDBF388D7D9CF022C7_at_QED>

Hi Jason,

Thanks for the info. Looks like you're right.

I checked "Rocks from Space", and color plate IV has a picture of a Toluca
specimen with a closeup of ferric hydroxide and hydrochloric acid exuding
from between the Widmanstatten plates.

And it looks like some of those brown "crossed lines" on the ebay sample.

So what should I do - inform the ebay seller that he has a sick patient on
his hands that he is trying to unload? :)

Thanks again.

Mark Grossman

----- Original Message -----
From: "Jason Utas" <meteoritekid at gmail.com>
To: "Kashuba" <mary.kashuba at verizon.net>; "Meteorite-list"
<meteorite-list at meteoritecentral.com>
Sent: Tuesday, August 04, 2009 9:04 PM
Subject: Re: [meteorite-list] Question on Toluca Sample that I came acrosson
ebay


Hello Mark, All,
Those squiggly lines are what Nininger coined "lawrencite," a
corrosive "disease" that occurs primarily in the presence of
terrestrial salts. While the term is fairly well-recognized, it
generally applies to meteorites which experience accelerated oxidation
even years after having been found, having spent long periods of time
in unfavorable climates.
The slice does indeed look like Toluca, and it might be a fine
specimen if refinished, but good luck with preserving it - maybe Bill
Mason might have a word on this.
That said, there are no troilite inclusions visible in the slice.
Regards,
Jason

On Tue, Aug 4, 2009 at 2:57 PM, Kashuba<mary.kashuba at verizon.net> wrote:
> Mark, List,
>
> It looks to me like an etched iron meteorite slice that has been clear
> coated and is rusting. Corrosion will boil up and worm its way around
> under
> coatings. Some Toluca have prominent troilite. None is obvious in this
> slice but it still could very well be a Toluca. Maybe someone read a
> description somewhere that mentioned troilite, saw the Widmanst?tten
> pattern
> and figured that is what the "crossed lines" are. You might pick it up
> cheap, refinish it and pray.
>
> Regards,
>
> - John
>
> John Kashuba
> Ontario, California
>
> -----Original Message-----
> From: meteorite-list-bounces at meteoritecentral.com
> [mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of Mark
> Grossman
> Sent: Tuesday, August 04, 2009 1:37 PM
> To: meteorite-list at meteoritecentral.com
> Subject: [meteorite-list] Question on Toluca Sample that I came across on
> ebay
>
> Would be interested on any comments on this Toluca sample that I came
> across
>
> on ebay. According to the seller, the sample was purchased from a
> collector
>
> in Spain named "Ceruda" and the troilite is "the crossed lines on the
> specimen."
>
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=180387460024&ssPageName=S
> TRK:MEWAX:IT
>
> Thanks.
>
> Mark Grossman
>
>
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Received on Tue 04 Aug 2009 09:30:29 PM PDT