[meteorite-list] My first classification - NWA 6696 (LL3.6)
From: Larry Atkins <thetoprok_at_meteoritecentral.com>
Date: Fri, 29 Apr 2011 13:54:31 -0400 Message-ID: <8CDD4ADA09FC989-2AE0-33616_at_webmail-d133.sysops.aol.com> Hi Mike, List, Congrat's on your classification! The way you described the meteorite as having armored chondrules and thinking it was possibly a CR, then finding out it's an LL 3.6 made me think of a very similar scenario that has recently played out for me. I thought a chondrite I bought in 2008 was possibly a CR as did some other list members and it turned out to be an LL 3.8. I'd like to see pictures of yours Mike, I wonder if it looks similar. Here's a link to pic's of my new classifications, NWA 6581, ( LL 6) and NWA 6582, the LL 3.8. http://s934.photobucket.com/albums/ad190/alienrockfarm/ I saw that yours is 1 of only 16 meteorites with that classification, so despite its "unassuming" status amongst a pile of lunars and such, it's still a rarity! Sincerely, Larry Atkins ? IMCA # 1941 Ebay?alienrockfarm ? -----Original Message----- From: Galactic Stone & Ironworks <meteoritemike at gmail.com> To: Meteorite List <meteorite-list at meteoritecentral.com> Sent: Fri, Apr 29, 2011 11:41 am Subject: [meteorite-list] My first classification - NWA 6696 (LL3.6) Hi List, Some new meteorites were added to the Met Bulletin today, including some new lunars. Hidden amongst the more exciting lunars is an unassuming LL3.6 - NWA 6696. This small 10g stone came in a batch of unclassified NWA that I purchased about 3 years ago. Upon windowing this small stone, I saw an adundance of armored chondrules. At first glance, it resembled a CR type. I posted some photos to this list, a minor discussion ensued, and then the sample went off to the lab to be looked at by Dr. Alan Rubin. Of course, it's not worthwhile for anyone to classify such a small OC when the 20/20 classification sample would only be 2 grams. So I offered to reverse the usual 20/20 arrangement - I'd keep 2 grams and the lab could keep the 8g "main mass". Now the classification is official. I was hoping to sneak my name into the literature, but alas, I didn't get to see my name in lights. LOL It should be noted, that for collectors, this is going to be one of those impossible to acquire NWAs. Given the low TKW and that 80% of the mass is sitting at UCLA, that leaves a scant 2g on the collector market. A while back, I swapped a small endcut to Greg Catterton and I still retain a 1g slice that is polished on one side. If anyone wants to make me an insane offer for the remaining 1g slice, I will entertain all such offers. ;) >From the write-up : Northwest Africa 6696 (NWA 6696) Morocco Purchased: 2007 Classification: Ordinary chondrite (LL3.6) Classification: Ordinary chondrite, LL3.7. The olivine Fa distribution (Fa24.4?9.1) and low-Ca pyx Fs distribution (Fs12.3?7.1) are appreciably more heterogeneous than those of Dhajala (type 3.8), indicating a subtype <3.8. The meteorite contains abundant low-Ca clinopyroxene with polysynthetic twinnning (indicating type <4) and moderately abundant fine-grained matrix material (most consistent with type 3.0-3.6). Clear chondrule glass is most abundant in type 3.0-3.5; this meteorite lacks clear chondrule glass, implying a subtype >3.5. Hence, 3.6 seems the most likely subtype. Best regards, MikeG ------------------------------------------------------------------------- -- Galactic Stone & Ironworks - Meteorites & Amber Website - http://www.galactic-stone.com Facebook - http://www.facebook.com/galacticstone News Feed - http://www.galactic-stone.com/rss/126516 Twitter - http://twitter.com/galacticstone EOM - http://www.encyclopedia-of-meteorites.com/collection.aspx?id=1564 ------------------------------------------------------------------------- --- ______________________________________________ Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html Meteorite-list mailing list Meteorite-list at meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-listReceived on Fri 29 Apr 2011 01:54:31 PM PDT |
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