Here a link with micropics of diverse etched steels ect. http://www.georgesbasement.com/Microstructures/Unknowns/Iron-Based/Specimen0 1.htm
Just click on "go to your analysis of Specimen n", to get more. Martin -----Ursprüngliche Nachricht----- Von: Drake [mailto:[EMAIL PROTECTED] Gesendet: Donnerstag, 1. Februar 2007 01:54 An: 'Martin Altmann'; 'Sterling K. Webb'; meteorite-list@meteoritecentral.com Betreff: RE: [meteorite-list] Etching Iron Meteorites I agree, "Zero". You could make nice Widmanstatten patterns in some stainless steel alloys like 303, the giant crystals I've seen would be virtually impossible and very expensive. The dendrites seen in cast irons are the crystals growing along the crystallographic planes as the metal solidifies. This is basically the same property in metals that also form the Widmanstatten patterns. It's also why snowflakes, and gemstones have their unique shapes; they are all growing crystals taking on the shape of their crystallographic planes, or atomic arrangement. (ie, salt is always a cube and an amethyst is always a tetrahedron.) Drake Quis Custodiet Ipsos Custodes Drake "Doc" Dameräu President, NEPRA NAR Section 614 L3CC member TRA 9934 L3 www.nepra.com www.rocketmaterials.org http://home.sprynet.com/~monel/home.htm > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:meteorite-list- > [EMAIL PROTECTED] On Behalf Of Martin Altmann > Sent: Wednesday, January 31, 2007 7:21 PM > To: 'Sterling K. Webb'; meteorite-list@meteoritecentral.com > Subject: Re: [meteorite-list] Etching Iron Meteorites > > "What's the likelihood of fake meteorites being made that way?" > > Zero. You have to fake at least pallasites for the fraud becoming > profitable > q.e.d. > > Would be nice to have a photo of the described products, if they show any > similarity to Widmathompsopatures. > (Cast irons display dendritic patterns). > > Martin, > Frozen in Tucson. > > > -----Ursprüngliche Nachricht----- > Von: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Im Auftrag von > Sterling > K. Webb > Gesendet: Donnerstag, 1. Februar 2007 00:43 > An: Drake; meteorite-list@meteoritecentral.com > Betreff: Re: [meteorite-list] Etching Iron Meteorites > > Hi, Drake, > > > ...Widmanstatten patterns are unique to > > meteorites. That's not true. > > I'll bite. In what other materials can they be found? > Long considered definitive hereabouts. I quote one > source: "Widmanstatten pattern or Thompson structure: > This pattern does not appear in terrestrial iron ores. > Its presence is diagnostic in the identification of a > meteorite." > Looking for a definition, I found that they form when > "steels are cooled at a critical rate from extremely high > temperatures. It consists of ferrite and pearlite and > has a cross-hatched appearance due to the ferrite > having formed along certain crystallographic planes." > What's the likelihood of fake meteorites being made > that way? > > Sterling K. Webb > ------------------------------------------------------------ > ----- Original Message ----- > From: "Drake" <[EMAIL PROTECTED]> > To: <meteorite-list@meteoritecentral.com> > Sent: Wednesday, January 31, 2007 4:52 PM > Subject: Re: [meteorite-list] Etching Iron Meteorites > > > That was I, and thank you. The Nital I was using was what I use for > standard metallographic sample preparation at 2% to 5%. I see now I need > a much higher concentration. > > I did find one metallurgical error in that it states that Widmanstatten > patterns are unique to meteorites. That's not true. > > Drake > > Quis Custodiet Ipsos Custodes > > Drake "Doc" Dameräu > President, NEPRA > NAR Section 614 > L3CC member > TRA 9934 L3 > > www.nepra.com > www.rocketmaterials.org > http://home.sprynet.com/~monel/home.htm > > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] > [mailto:meteorite-list- > > [EMAIL PROTECTED] On Behalf Of Gary K. Foote > > Sent: Tuesday, January 30, 2007 6:21 PM > > To: meteorite-list@meteoritecentral.com > > Subject: [meteorite-list] Etching Iron Meteorites > > > > Hello List, > > > > I forget who was asking this morning, but Ruben Garcia has graciously > > allowed me to > > publish his in-depth article on cutting, etching and preserving iron > > meteorites to my > > site. > > > > For those interested the URL is; > > > > http://www.meteorite-dealers.com/etchingandpreservation.html > > > > Gary > > http://www.meteorite-dealers.com > > ______________________________________________ > > Meteorite-list mailing list > > Meteorite-list@meteoritecentral.com > > http://six.pairlist.net/mailman/listinfo/meteorite-list > > ______________________________________________ > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > > > ______________________________________________ > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > > ______________________________________________ > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list ______________________________________________ Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list