----- Original Message ----- From: "MARK BOSTICK" <[EMAIL PROTECTED]>
To: <meteorite-list@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
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