Elton: Take a look - the Smithsonian classifies the meteorites from Antarctica and some of the Irons are described as having a fusion crust.
Greg S. http://curator.jsc.nasa.gov/antmet/samples/petdes.cfm?sample=MIL07666 Sample Number MIL 07666 Pairing MIL 07666 Newsletter 31,2 Location Miller Range Field Number 18159 Dimensions 5.0 x 2.9 x 1.4 Weight 96.25 Original Classification Iron (IIAB) Macroscopic Description - Cari Corrigan and Linda Welzenbach This lozenge-shaped meteorite is flight oriented with a slight melt flange on the top side. The bottom or flight surface is finely pitted, the top side smoother but with sporadic, deeper regmaglypts. Fusion crust is 100% and exhibits mild oxidation in the form of iridescence and minor halos. Thin Section Description - Tim McCoy, Cari Corrigan and Linda Welzenbach The meteorite was examined from a cut and etched surface, which bisected one end or nose of the specimen. A thin fusion crust is preserved over most of the meteorite, and gradational heat alteration zone of approximately 1.0-2 mm thick underlies the fusion crust on the bottom or flight side, and is less than 0.3 mm thick on the top side. A prominent coarse a2 structure is found throughout. The section exhibits subequant grains ranging up to 1 mm in size which meet at 120° triple j ---------------------------------------- > Date: Wed, 18 Nov 2009 19:30:39 -0800 > From: mstrema...@yahoo.com > To: e...@meteoritesusa.com; meteorite-list@meteoritecentral.com > Subject: Re: [meteorite-list] Fusion Crust on Irons--Not > > Stopping in a few minutes to state again that all this discussion about > fusion crust on irons is right next to unicorns postulations. Everyone says > that fusion crust on irons exists but no one can come up with the proof. > Non-silicate bearing irons DO NOT/CANNOT have FUSION crust: they have a very > fragile magentite micro-crystal "film" and they have an ablation surface but, > they can't by definition have a "fusion crust" and no matter whom the expert > quoted they still do not have a fusion crust. A fusion crust has to have a > silicate source to for the glass component of the crust-- Nada, Nix, No How. > > Both silicate and non-silicate meteorites have an ablated/ablation surface, > and they can show flight features--but not all meteorites have a fusion > crust. I have some OCs which have flow lines UNDER the fusion crust remnants. > > If anyone still defends the presence of fusion crust on (non-silicate > bearing) irons then show me the "crust"...can't?..ok show me the glass? .... > right then-- no photos, no thin sections, no micro graphs???......And while > there was one close up of an ablated surface showing soft wavy lines of > briefly melted metal that was aligned to aerodynamic vectors--This does not > fusion crust make. > > Unlike in politics and public opinion, in science, no matter how often an > untruth is repeated it doesn't become "truth" by majority belief. But > science, being a human endeavor, sometimes can find itself "off track" and > when it does it accepts the error and gets back on track. > > Elton > ______________________________________________ > http://www.meteoritecentral.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list _________________________________________________________________ Windows 7: It works the way you want. Learn more. http://www.microsoft.com/Windows/windows-7/default.aspx?ocid=PID24727::T:WLMTAGL:ON:WL:en-US:WWL_WIN_evergreen:112009v2 ______________________________________________ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
