[meteorite-list] AD: Special: Truly baffling & sensational Howardite - NWA 6709 - iridescence

From: James Baxter <jbaxter112_at_meteoritecentral.com>
Date: Thu, 21 Jul 2011 13:12:15 -0400
Message-ID: <109650654.3842991311268335655.JavaMail.root_at_zmcs01l-pol-08.portal.webmd.com>

There is sometimes a similar though less dramatic iridescence on the crust of newly fallen ordinaary chondrites that have not been exposed to significant weathering.

Jim Baxter


----- Original Message -----
From: "Marc Fries" <mfries8 at hotmail.com>
To: meteorite-list at meteoritecentral.com
Sent: Thursday, July 21, 2011 9:53:21 AM GMT -08:00 US/Canada Pacific
Subject: Re: [meteorite-list] AD: Special: Truly baffling & sensational Howardite - NWA 6709 - absolutely stunning and very fresh.

Mild oxidation of silicate glass (fusion crust in this case) can produce
a rainbow effect, too. I've seen this in basalts in the field. I think
it is from a sheen of iron oxides created as the iron and/or sulfide
weathers out.

Cheers,
Marc Fries

On 7/21/11 1:13 AM, Aubrey Whymark wrote:
> Hi
>
> The rainbow colour looks like oil to me. Maybe someone has used oil or WD40 to clean it. I sometimes encounter 'rainbow' tektites and the guys want extra because of it - in reality it is due to oil contamination, probably from the mining operations.
>
> Regards, Aubrey
> www.tektites.co.uk
>
>
>
> --- On Thu, 21/7/11, Martin Altmann<altmann at meteorite-martin.de> wrote:
>
>> From: Martin Altmann<altmann at meteorite-martin.de>
>> Subject: Re: [meteorite-list] AD: Special: Truly baffling& sensational Howardite - NWA 6709 - absolutely stunning and very fresh.
>> To: meteorite-list at meteoritecentral.com
>> Date: Thursday, 21 July, 2011, 0:33
>> Hi Mike,
>>
>> no worries, neither we understood it like that.
>>
>> Of course, if one looks to the photos, the first idea,
>> which comes to one's
>> mind is: oil.
>> No idea, what causes this effect, maybe the composition.
>> Also that strange
>> tint the cut faces reveal.
>>
>> And especially worrying is the variety of the odd
>> inclusions. I mean
>> normally we all get already excited, whenever we find a
>> carbonaceous
>> fragment in a howardite,
>> but what that stone has all for strange clasts - that is
>> really not normal
>> anymore.
>>
>> Since 1999 Stefan is in Morocco and since then we certainly
>> had quite a
>> bunch of materials in our hands,
>> but such a weird polymict one - extremely unusual.
>>
>> And it seems that many collectors feel the same, if after
>> such a short time
>> now only three slices are left.
>>
>> Now all of the smaller ones are gone, sorry for that. But
>> we have still a
>> slice left, which we could subdivide into small partslices,
>> if desired - but
>> for that one has really to raise his finger.
>>
>> For the moment!
>> Martin
>>
>> -----Urspr?ngliche Nachricht-----
>> Von: meteorite-list-bounces at meteoritecentral.com
>> [mailto:meteorite-list-bounces at meteoritecentral.com]
>> Im Auftrag von Galactic
>> Stone& Ironworks
>> Gesendet: Donnerstag, 21. Juli 2011 00:48
>> An: Chladnis Heirs
>> Cc: meteorite-list at meteoritecentral.com
>> Betreff: Re: [meteorite-list] AD: Special: Truly baffling
>> & sensational
>> Howardite - NWA 6709 - absolutely stunning and very fresh.
>>
>> Hi Martin,
>>
>> I didn't mean to impeach the meteorite, I was just
>> curious.
>>
>> This is indeed a mystery. Have any scientists offered
>> or agreed to
>> look at it? Perhaps hit the rainbow area with the
>> microprobe or SEM?
>>
>> Aesthetically speaking, it's gorgeous and looks like Mother
>> of Pearl. :)
>>
>> Best regards,
>>
>> MikeG
>>
>> --
>> ----------------------------------------------------------------------------
>> -----
>> Galactic Stone& Ironworks - Meteorites& Amber
>> (Michael Gilmer)
>>
>> Website - http://www.galactic-stone.com
>> Facebook - http://tinyurl.com/42h79my
>> News Feed - http://www.galactic-stone.com/rss/126516
>> Twitter - http://twitter.com/galacticstone
>> EOM - http://www.encyclopedia-of-meteorites.com/collection.aspx?id=1564
>> ----------------------------------------------------------------------------
>> -----
>>
>> On 7/20/11, Chladnis Heirs<news at chladnis-heirs.com>
>> wrote:
>>> No, it's natural!
>>>
>>> Martin
>>>
>>>
>>> -----Urspr?ngliche Nachricht-----
>>> Von: Galactic Stone& Ironworks [mailto:meteoritemike at gmail.com]
>>> Gesendet: Mittwoch, 20. Juli 2011 23:24
>>> An: Chladnis Heirs
>>> Cc: meteorite-list at meteoritecentral.com
>>> Betreff: Re: [meteorite-list] AD: Special: Truly
>> baffling& sensational
>>> Howardite - NWA 6709 - absolutely stunning and very
>> fresh.
>>> Wow! That is one of the most beautiful
>> howardites I have ever seen.
>>> Nice find. :)
>>>
>>> The rainbox coloration is very odd. Was the
>> stone cleaned at any time?
>>> Best regards,
>>>
>>> MikeG
>>>
>>>
>> ----------------------------------------------------------------------------
>>> -----
>>> Galactic Stone& Ironworks - Meteorites&
>> Amber (Michael Gilmer)
>>> Website - http://www.galactic-stone.com
>>> Facebook - http://tinyurl.com/42h79my
>>> News Feed - http://www.galactic-stone.com/rss/126516
>>> Twitter - http://twitter.com/galacticstone
>>> EOM - http://www.encyclopedia-of-meteorites.com/collection.aspx?id=1564
>>>
>> ----------------------------------------------------------------------------
>>> -----
>>>
>>> On 7/20/11, Chladnis Heirs<news at chladnis-heirs.com>
>> wrote:
>>>> Dear meteorite community,
>>>>
>>>> with this Special we have to introduce to you an
>> enormous oddity.
>>>> It is about a HED-meteorite of a kind, which we
>> hadn't ever seen before
>> in
>>>> our careers before.
>>>>
>>>> It came in two stones, one of them was covered
>> with a lush fusion crust,
>>>> wonderfully structured by thick and oriented
>> flowlines.
>>>> And in some parts, that very crust displayed a
>> gloss and a shine,
>>> iridescent
>>>> in all colours of the rainbow;
>>>> an effect, reminding almost to bismuth!
>>>>
>>>> Please take a look to the photos, where we tried
>> to captured the effect:
>>>> http://www.chladnis-heirs.com/new-meteorites/nwa6709.html
>>>>
>>>>
>>>> The interior was no less a riddle for us.
>>>> The distribution and sizes of the various
>> fragments and clasts were
>> unlike
>>>> we had seen in any polymict HED before.
>>>> A variety of clasts is of a kind, like we never
>> had recovered in any
>> Vesta
>>>> meteorite. Please take a closer look to the slices
>> and you will share our
>>>> surprise.
>>>>
>>>> And a very few of these clasts develope due to
>> their microscopically
>>>> lamellae-texture a fire like an opal, if turned
>> around in the light.
>>>> The response to a magnet is very inhomogeneous
>> within the slices,
>>>> although no differences are visible to the eye
>>>> and all in all the interior has a somewhat dull
>> yellowish tint - although
>>>> the material is very fresh - and that tint and the
>> circumstances made us
>>>> initially think, it might be diogenitic.
>>>>
>>>> It is under classification at Dr. Anthony Irving
>> and the values say, that
>>> it
>>>> is a shocked howardite.
>>>>
>>>> We crafted now a set of polished sliced of all
>> sizes, to share this
>>>> exceptional material with you.
>>>> Please acknowledge that we have kept the price,
>> despite of the for us so
>>>> unique properties of the material, well
>> affordable,
>>>> for everybody staying able to add a specimen of
>> this truly exceptional
>>> stone
>>>> to his collection.
>>>> And an addition it is, also for the most
>> experienced veteran collector.
>>>> Earlier today we had published the Special in the
>> German forum, therefore
>>>> not so many specimens are left.
>>>>
>>>> For the largest slice we can offer a discount as
>> it is the only one,
>> which
>>>> isn't coplanar.
>>>>
>>>> And finally, the specimen named "piece #2", which
>> we chose to illustrate
>>>> best that rainbow-bismuth-gloss of the fusion
>> crust on the first linked
>>>> page, is available too. It weighs 119.2g and we're
>> accepting offers.
>>>> Here you are now:
>>>> http://www.chladnis-heirs.com/specials/special-nwa6709.html
>>>>
>>>>
>>>> Best Regards,
>>>> Stefan& Martin
>>>>
>>>> Chladni's Heirs
>>>> Munich - Berlin
>>>> Fine Meteorites for Science& Collectors
>>>>
>>>> http://www.chladnis-heirs.com
>>>>
>>>>
>>>>
>>>> ______________________________________________
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>>>>
>>>
>>> --
>>>
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Received on Thu 21 Jul 2011 01:12:15 PM PDT