[meteorite-list] D'Orbigny, Unusual Angrite, Thin Section Photographs
From: tett <tett_at_meteoritecentral.com>
Date: Wed May 11 17:16:59 2005 Message-ID: <001e01c5566e$c7ee9460$6500a8c0_at_Tettenborn> Mark, Very beautiful images. Yes, this is a fantastic thin section! Not sure if your observations are correct but I am probably more if an amateur than you are so my opinions would carry even less weight. Please let me know where/how you got this thin section as I would love to add such an example to my collection. Cheers, tett ----- Original Message ----- From: "MARK BOSTICK" <thebigcollector_at_msn.com> To: <meteorite-list_at_meteoritecentral.com> Sent: Wednesday, May 11, 2005 12:32 PM Subject: [meteorite-list] D'Orbigny, Unusual Angrite,Thin Section Photographs > Hello list, > > (Forgive me for if any of the following is scientifically wrong, this is > my observations paired with my at times limited knowledge.) > > I recently received a D'Orbigny thin section. Which I have placed several > photographs of on my web site at the following web page. > > http://www.meteoritearticles.com/coldorbigneyts.html > > One the best thin sections I have. OK, move over NWA 998, it is the best. > This is due to its prismatic augite crystals, often found twisted with > olivine, randomly placed anorthite shards, and the many large vugs/vug > inclusions, in the stone. Some of these are filled with olivine or glass, > some are empty and some are hollow, meaning the show traces of the former. > In one vug on my thin section, is a well formed specter shaped crystal > sticking out. In my microscope it appears bright red, so perhaps it is > olivine. Another interesting note on the crystal that it formed in a > hollow vug. Meaning in a vug that has traces of the former minerals that > once filled the vug. This would mean of course that it formed after > whatever was in the vug, which is most likely olivine. This is all my > amateur observation and if anyone thinks the crystal, seen in photo 7, is > not olivine, let me know your opinion please. Also photo 7 and photo 11, > shows particle bugs with, under cross polars, appears brown as shown. This > is what I think are hollow vugs, as described in a couple of papers. The > former mineral thing again. Empty vug walls are shown in photos 7 and 8. > > Opinions and thoughts welcomed, > > Clear Skies, > Mark Bostick > Wichita, Kansas > http://www.meteoritearticles.com > http://www.kansasmeteoritesociety.com > http://www.imca.cc > > http://stores.ebay.com/meteoritearticles > > > ______________________________________________ > Meteorite-list mailing list > Meteorite-list_at_meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list > Received on Wed 11 May 2005 05:17:01 PM PDT |
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