[meteorite-list] NWA 6709 - iridescence
From: Galactic Stone & Ironworks <meteoritemike_at_meteoritecentral.com>
Date: Thu, 21 Jul 2011 15:38:52 -0400 Message-ID: <CAKBPJW9ug0J9OON1TMAv7eTRm1ZZ0N5wQW96qO+wWH9jp_K4eA_at_mail.gmail.com> Hi Folks, Whatever it is, it sho is purty! :) Those Murchisons in the replies were purty also. 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 7/21/11, James Baxter <jbaxter112 at pol.net> wrote: > Pure speculation but my guess is that the rainbow sheen comes from > refraction due to some fine layering of material on the surface. In the case > of fresh unweathered falls it is almost certainly a phenomenon related to > the crust formation itself but one could imagine weathering causing a > similar effect due to thin layers of oxide or other weathering product. > > So maybe similar effect with two different causes?? > > In Martin and Stefans' case, seems more likely to be a primary crust related > finding in a minimally weathered desert find rather than due to weathering, > but again just speculation > > Jim Baxter > > > ----- Original Message ----- > From: "Marc Fries" <mfries8 at hotmail.com> > Cc: meteorite-list at meteoritecentral.com > Sent: Thursday, July 21, 2011 10:47:39 AM GMT -08:00 US/Canada Pacific > Subject: Re: [meteorite-list] AD: Special: Truly baffling & sensational > Howardite - NWA 6709 - iridescence > > 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 >>>>>> >>>>>> >>>>>> >>>>>> ______________________________________________ >>>>>> Visit the Archives at >>>>>> http://www.meteoritecentral.com/mailing-list-archives.html >>>>>> Meteorite-list mailing list >>>>>> Meteorite-list at meteoritecentral.com >>>>>> http://six.pairlist.net/mailman/listinfo/meteorite-list >>>>>> >>>>> -- >>>>> >>>>> ______________________________________________ >>>>> Visit the Archives at >>>>> http://www.meteoritecentral.com/mailing-list-archives.html >>>>> Meteorite-list mailing list >>>>> Meteorite-list at meteoritecentral.com >>>>> http://six.pairlist.net/mailman/listinfo/meteorite-list >>>>> >>>> ______________________________________________ >>>> Visit the Archives at >>>> http://www.meteoritecentral.com/mailing-list-archives.html >>>> Meteorite-list mailing list >>>> Meteorite-list at meteoritecentral.com >>>> http://six.pairlist.net/mailman/listinfo/meteorite-list >>>> >>>> ______________________________________________ >>>> Visit the Archives at >>>> http://www.meteoritecentral.com/mailing-list-archives.html >>>> Meteorite-list mailing list >>>> Meteorite-list at meteoritecentral.com >>>> http://six.pairlist.net/mailman/listinfo/meteorite-list >>>> >>> ______________________________________________ >>> Visit the Archives at >>> http://www.meteoritecentral.com/mailing-list-archives.html >>> Meteorite-list mailing list >>> Meteorite-list at meteoritecentral.com >>> http://six.pairlist.net/mailman/listinfo/meteorite-list >>> >> ______________________________________________ >> Visit the Archives at >> http://www.meteoritecentral.com/mailing-list-archives.html >> Meteorite-list mailing list >> Meteorite-list at meteoritecentral.com >> http://six.pairlist.net/mailman/listinfo/meteorite-list >> >> >> >> > > ______________________________________________ > Visit the Archives at > http://www.meteoritecentral.com/mailing-list-archives.html > Meteorite-list mailing list > Meteorite-list at meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > > ______________________________________________ > Visit the Archives at > http://www.meteoritecentral.com/mailing-list-archives.html > Meteorite-list mailing list > Meteorite-list at meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list >Received on Thu 21 Jul 2011 03:38:52 PM PDT |
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