Matt & List, First, Matt, thanks for the info and congrats on having that terrific specimen in your already spectacular collection...simply superb.
This prompts a second question, which is "Why is there not a means to 'officially' correct the record when a fall or find turns out to have a dramatically different TKW at some point after the formal classification has cleared?" I'm not talking about confusion in the early stages of mining a strewn field, but rather about falls and/or finds where in many cases decades have passed since the initial discoveries and, for all intents and purposes, everything that will ever be found has been found (a slippery slope of a generalization, but hopefully this makes sense). There are many, many such examples, and I'll post a link to only one below (read Remarks in my Djermaia listing): http://www.fallingrocks.com/Collections/Djermaia.htm I purchased my Chiang-Khan from a dealer without much research, which was completely my responsibility, to be clear. That said, it was marketed as representing something approaching 5% of the recovered material from that fall (which, again, is officially recorded as 367 grams when we know that there is one stone of almost twice that size and speculation on the list is that the TKW is actually likely to be near 7 kilograms). We had some banter about the finer points of orientation a couple of weeks ago and how that has an impact in the marketplace, and it seems to me that this is at least as large an issue. And, forgetting the market altogether, shouldn't there perhaps be a more focused effort to "get the record straight" for the benefit of history? I'm probably missing something out of ignorance here... Thanks in advance for thoughts and comments...always trying to learn something new. Dave -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Saturday, March 22, 2008 10:08 AM To: [EMAIL PROTECTED]; 'Martin Altmann'; Meteorite-list@meteoritecentral.com Subject: Re: [meteorite-list] More on Chiang Khan I do have Bob's piece (main mass) in my collection, which also shows the brecciation. I can't recall the exact weight of the piece, but it can be seen on my collection page...www.mhmeteorites.com. It is a beautiful specimen shaped like a big jellybean. Matt Morgan ---------------------- Matt Morgan Mile High Meteorites http://www.mhmeteorites.com P.O. Box 151293 Lakewood, CO 80215 USA -----Original Message----- From: "Dave Gheesling" <[EMAIL PROTECTED]> Date: Sat, 22 Mar 2008 09:46:43 To:"'Martin Altmann'" <[EMAIL PROTECTED]>,<Meteorite-list@meteoritecentral.com> Subject: Re: [meteorite-list] More on Chiang Khan Martin & List, That is a terrific specimen, Martin, and thanks for sharing the image. My collection piece is small, but there is a cut face where some detail can be seen (scroll down, as it's the bottom image): http://www.fallingrocks.com/Collections/ChiangKhan.htm Sending this along as a follow-up to your mention of the interior below... Also, I believe the official TKW on this fall is 367 grams. But I seem to recall that Bob Haag had a single individual almost twice that size in one of his earlier catalogs. Does anyone have a sense for what the approximate total recovered weight might be? Best, Dave -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Martin Altmann Sent: Saturday, March 22, 2008 9:28 AM To: Meteorite-list@meteoritecentral.com Subject: Re: [meteorite-list] More on Chiang Khan And a little addendum: If cut, several Chiang Khans show a brecciation like Juancheng. Here an oriented example in possession of Oliver Alge, who a while ago investigated the fall and recovered several stones more. http://www.meteorite-oliver.com/f23-1.jpg Unfortunately Chiang Khan became a victim of the recent hammer-hysterogeny and got very expensive nowadays. Happy Easter Martin -----Ursprüngliche Nachricht----- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von [EMAIL PROTECTED] Gesendet: Samstag, 22. März 2008 14:03 An: Meteorite-list@meteoritecentral.com Betreff: [meteorite-list] More on Chiang Khan Yagi K. et al. (1987) Petrology and Magnetic Properties Of Chiang Khan, Thailand, Meterorite (Meteoritics 22-4, 1987, pp. 536-537): Chiang Khan meteorite fell on Nov. 17, 1981 at Chiang Khan, Loei, Thailand. The meteorite consists of olivine, orthopyroxene, clinopyroxene, chromite, FeNi metal, plagioclase, glass, troilite, and phosphate in order of abundance. Olivine always forms barred or porphyritic chondrules. Its composition is very homogeneous with an average of Fo80, which is very close to the average com- position of olivine of equilibrated H chondrites (Van Schmus, 1969). Orthopyro- xene usually forms radiating chondrules as fibrous crystals, whereas clinopyroxene is much less, occurring as fibrous crystals in the devitrified glass or minute crystals in the rim of orthopyroxene. Both orthopyroxene and clinopyroxene have compositions similar to those of these pyroxenes of equilibrated H chondrites (Van Schmus, 1969). Ca-poor pyroxene is nearly always orthopyroxene and clinoenstatite is almost absent. Plagioclase is present as microcrystalline aggregates only in a groundmass of chondrules. Chondrules are present, showing their textures well, but their outlines are often not clear. Glass is more or less devitrified, resulting in aggregates of fibrous or microcrystals. The composition of these aggregates is similar to that of Ca-rich pyroxene + albitic plagioclase. When compositions of chromite are plotted in a diagram Mg/(Mg +Fe) vs. Al/ (Al + Cr), all of them fall in the field of H chondrites (Bunch et al., 1967). From these features the meteorite is classified as an equilibrated chondrite of H5 type (Van Schmus and Wood, 1967). Water content and magnetic properties were measured. Bunch T.E., Keil K., and Snetsinger K.G. (1967) GCA 31, 1569-1582. Van Schmus (1969) Earth Sci. Rev. 5, 145-184. Van Schmus WR. and Wood J.A. (1967) GCA 31, 747-765. ______________________________________________ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list ______________________________________________ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list ______________________________________________ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list ______________________________________________ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list