Darryl wrote: "The following is for chondrule lovers..." Hi List,
Let me assure you that NWA 5717 is not only a "must have" for chondrule lovers but also an absolute "must have" for any avid meteorite and thin section collector. When I received my specimen + thin section some months ago, I was almost carried away and there were lots of "oohs" and "aahs" when I first beheld my thin section in cross-polarized light. Some of my pictures can be found in the online Encyclopedia of Meteorites! NWA 5717 is so unique that one of the lead researchers wrote about it the following: "... this is one of the most significant chondrites to come along in some time ..." The two equally "primitive" 3.05 lithologies are a feast for the eyes and my thin section is rich in large BO chondrules. There are also both porphyritic chondrules and pyroxene chondrules - the latter displaying undulose extinction. Chondrules are crisp and chondrule boundaries are sharply delineated. In my thin section I also detected a 1.625 x 1.375 mm BO chondrule with extremely strongly zoned chondrule olivine. A large, dark cryptocrystalline chondrule (2.5 x 2.5 mm) does not only display undulose extinction but is moreover composed of several differently oriented single components (polysomatic). NWA 5717 is undoubtedly one of my absolute collection hightlights! Best wishes, Bernd To: [email protected] [email protected] ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
