[meteorite-list] Battle Mountain color

From: Meteorite-Recon.com <info_at_meteoritecentral.com>
Date: Thu, 6 Sep 2012 13:43:03 +0200 (CEST)
Message-ID: <1801097303.171745.1346931783294.JavaMail.open-xchange_at_email.1und1.de>

The color differences are due to variations in the magnetite contents in the
crusts of opposite sides. These, in turn, are controlled by the supply of
atmospheric oxygen and the temperature of the oxidation process. A temporary
high vacuum on a trailing side, for example, reduces or blocks the supply of
atmospheric oxygen to the reaction.

If you scroll down the page you will see a good example of fusion crust color
variation on a Buzzard Coulee specimen:

http://www.meteorite-recon.com/en/Meteorite_fusion_crust_2.htm

Cheers

Svend

www.meteorite-recon.com





Jeff Kuyken <info at meteorites.com.au> hat am 6. September 2012 um 11:20
geschrieben:

> I agree with Dolores too and you would really need to see the pieces in
> person. Some of you might recall how stones from some fresh falls can have
> part of the stone with a shiny browner coloured crust. Oum Dreyga was one
> that had quite a few stones like that and I think Bassikounou too. It has
> been discussed on the list in the past. Also, if you look around the edge of
> the stone Sonny pictured, you will see it appears black in those areas.
>
> Cheers,
>
> Jeff
>
> -----Original Message-----
> From: meteorite-list-bounces at meteoritecentral.com
> [mailto:meteorite-list-bounces at meteoritecentral.com] On Behalf Of D. Hill
> Sent: Thursday, 6 September 2012 6:14 AM
> To: meteorite-list at meteoritecentral.com
> Subject: Re: [meteorite-list] Battle Mountain color
>
>
> I agree with Adam. I, too, have noticed that images of some meteorites,
> including fresh falls, may appear black or brownish depending on the
> lighting conditions (type, white balance, flash/no flash, angle) and
> camera exposure... even though they may look black to the naked eye. I
> think all would agree it is best to see meteorites in person.
>
> -Dolores Hill
>
> On 9/5/2012 12:51 PM, Adam Hupe wrote:
> > I have not seen any of this material first-hand but I was thinking the
> same thing when I saw Bob Verish's images. Perhaps it rained in Northern
> Nevada or many times fresh falls take on a brownish hue. If the miner's
> stone was found within a few hours of the fall, then I would think the
> stones have a natural brownish hue or it could be the white balance is off
> on the digital camera.
> >
> >
> > Happy hunting,
> >
> > Adam
> >
> >
> >
> >
> > ----- Original Message -----
> > From: Mike Tettenborn<tett at rogers.com>
> > To: wahlperry at aol.com
> > Cc: meteorite-list at meteoritecentral.com
> > Sent: Wednesday, September 5, 2012 12:40 PM
> > Subject: Re: [meteorite-list] Battle Mountain Field report / strewn field
> conditions / etc.
> >
> > I had the exact same impression. This one looks like a somewhat weathered
> NWA.
> >
> > Could be the lighting.
> >
> > But, Adam Hupe reported multiple finds so far so this could be legit.
> >
> > tett
> >
> >
> > Mike Tettenborn
> > Owen Sound, Ontario, Canada
> > tett at rogers.com
> >
> >
> >
> > On 2012-09-05, at 2:49 PM, wahlperry at aol.com wrote:
> >
> >> Hi All,
> >>
> >> I have posted a few pictures of the strewnfield and a large chondrite on
> my website.A couple of the roads in the area will be posted with No
> trespassing signs later this week. The reason is for mine safety
> regulations.The project supervisor was very nice and explained the biggest
> concern is safety.If anything was to happen on the mining clam, the site
> would be shut down.
> >>
> >> Thanks,
> >> Sonny
> >>
> >>
> >> http://www.nevadameteorites.com/nevadameteorites/Battle_Mt.html
> >> ______________________________________________
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Received on Thu 06 Sep 2012 07:43:03 AM PDT


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