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