Dear Martin and List, Respectfully Martin, because it has not be classified by a qualified scientist. An IMB commands a different price than a breccia. Best, Dirk
--- Martin Altmann <[EMAIL PROTECTED]> wrote: > Hi Jeff, > > why it should not be an IMB? > Maybe you have in mind, if you think to an IMB, only > such optically on first > glimpse uniformly looking black IMBs like Cat > Mountain or el Kachla, as they > have only a poor contrast between melt and clasts? > An IMB has not to have lost all chondritic > structures, it hasn't to be > totally and completely recrystallized. > On contrary a characteristicum of a IMB is the > mixture of molten material > and unmolten material with chondritic structure. > Some say the chondritic > parts are remainders of the impactor, others that > the melt was pressed by > impact into the chondritic host material, again > others see many different > impact events...depending, what is to be found in > the very location. > > > Take a look on this slice from Erich Haiderer of > famous Rio Limay: > http://www.meteorite.com/Erichs/riolimay.jpg > Look at the upper part. Do you see the clasts? > > And voila Dho 010: > http://www.star-bits.com/dhofar010.htm > (didn't found in that hurry pictures of larger > slices) > > Cat Mountain I hadn't in my hands yet, > but perhaps you'll find also some nice chondrules > left in the single rounded > fragment in your specimen: > http://www.meteorites.com.au/odds&ends/catmountain.jpg > > Ah - I see, you listed some samples on your hp, a > little IMB-page: > http://www.meteorites.com.au/odds&ends/impactmelts.html > > Look there Matteo, the melt hasn't to be metal free, > see NWA 2085 > and if I think of El Kachla-NWA 722, the dynamic > looking distribution of the > metal in the molten parts is the main reason, why > that IMB is so > spectacular! > http://www.meteorite.fr/en/forsale/IMB.htm > More interesting would be, Matteo, whether you can > find chondrules in that > parts supposed to be a melt. > > Hence, if I look at Carstens fullslice of Capot Rey > on his pages, > http://www.gi-po.de/main_eng.htm , > I really can't follow you Jeff, why you exclude with > such a certainity that > it can't be an IMB? > Is it because the slice recently shown by Carsten > has such a small surface, > that you guess that the melt streams are only some > somewhat larger shock > veins? > (Cahaaarsten, please send a detailled picture of the > full slice from your > hp, make also some close ups. We want to see the > stuff!) > In Dho 010 for example, you find also aereas, where > the rounded clasts are > sitting very close to each other. > (O Carsten, are you sick? That cool NWAxxx IMB is > much to cheap with 5$/g) > > Anyway, if you're not content with simple > eyeproving, > voila IMCA should enter the stage - we know, how > difficult it is to find a > place, where classification is done in a > non-biblical time, > therefore I'm sure IMCA will help to find a place > and Carsten will give a > nice IMB-Capot-Rey piece to get it examined, > if you feel better then. > Thrilling, isn't it? > > Cheerio! > Martin > > > > ----- Original Message ----- > From: "Jeff Kuyken" <[EMAIL PROTECTED]> > To: "Martin Altmann" <[EMAIL PROTECTED]>; > <[email protected]> > Sent: Saturday, September 24, 2005 3:57 AM > Subject: Re: [meteorite-list] Capot Rey...photos > please of the H5 > > > > Hi Martin, > > > > I can certainly see what you are saying but that > was not really my point. > My > > point is that it is not up to us to 'make-up' > classifications without the > > proper science being done. Admittedly, I've only > seen a few photos of the > > Caopt Rey pieces and in my opinion the one that > was just posted by Cartsen > > is certainly a highly shocked piece but it's not > an IMB. I think if you > > compare them to meteorites like Cat Mountain or > Mike Farmer's NWA 2085 you > > will see what I mean. That said, it is certainly a > gorgeous meteorite > which > > I wouldn't mind having a piece myself! ;-) > > > > Cheers, > > > > Jeff > > > > ______________________________________________ > Meteorite-list mailing list > [email protected] > http://six.pairlist.net/mailman/listinfo/meteorite-list > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ______________________________________________ Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
