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" <[email protected]> To: [email protected] 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<[email protected]> wrote: > >> From: Martin Altmann<[email protected]> >> Subject: Re: [meteorite-list] AD: Special: Truly baffling& sensational >> Howardite - NWA 6709 - absolutely stunning and very fresh. >> To: [email protected] >> 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 >> >> -----Ursprüngliche Nachricht----- >> Von: [email protected] >> [mailto:[email protected]] >> Im Auftrag von Galactic >> Stone& Ironworks >> Gesendet: Donnerstag, 21. Juli 2011 00:48 >> An: Chladnis Heirs >> Cc: [email protected] >> 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<[email protected]> >> wrote: >>> No, it's natural! >>> >>> Martin >>> >>> >>> -----Ursprüngliche Nachricht----- >>> Von: Galactic Stone& Ironworks [mailto:[email protected]] >>> Gesendet: Mittwoch, 20. Juli 2011 23:24 >>> An: Chladnis Heirs >>> Cc: [email protected] >>> 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<[email protected]> >> 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 >>>> [email protected] >>>> http://six.pairlist.net/mailman/listinfo/meteorite-list >>>> >>> >>> -- >>> >>> ______________________________________________ >>> Visit the Archives at >>> http://www.meteoritecentral.com/mailing-list-archives.html >>> Meteorite-list mailing list >>> [email protected] >>> http://six.pairlist.net/mailman/listinfo/meteorite-list >>> >> ______________________________________________ >> Visit the Archives at >> http://www.meteoritecentral.com/mailing-list-archives.html >> Meteorite-list mailing list >> [email protected] >> http://six.pairlist.net/mailman/listinfo/meteorite-list >> >> ______________________________________________ >> Visit the Archives at >> http://www.meteoritecentral.com/mailing-list-archives.html >> Meteorite-list mailing list >> [email protected] >> http://six.pairlist.net/mailman/listinfo/meteorite-list >> > ______________________________________________ > Visit the Archives at > http://www.meteoritecentral.com/mailing-list-archives.html > Meteorite-list mailing list > [email protected] > http://six.pairlist.net/mailman/listinfo/meteorite-list > ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
