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

From: Marc Fries <mfries8_at_meteoritecentral.com>
Date: Thu, 21 Jul 2011 10:47:39 -0700
Message-ID: <BLU0-SMTP1812634F35F768C7C8EFC35F14F0_at_phx.gbl>

That brings up a good question, then - is this iridescence the result of
weathering, or does it come from heating? Either could cause mild
oxidation. I had assumed that the iridescence I saw in basalts came
from weathering, but perhaps it was a consequence of heating. Basalt
gets plenty hot. :-) I like this discussion. Thoughts?

On 7/21/11 10:12 AM, James Baxter wrote:
> 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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>>>>> http://www.meteoritecentral.com/mailing-list-archives.html
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>>>>>
>>>> --
>>>>
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Received on Thu 21 Jul 2011 01:47:39 PM PDT