I am still waiting to receive information from
the classifiers to make my final judgment of what
my recommended classification will be. The
problem is that polymict breccias are not usually
classified this way. If they were, we would have
classifications like Sharps (H3-CM2) or Kapoeta
(Howardite-CM2) or Kaidun (CR2-CI1-CM1-CM2-L3-EH-EL-R-achond anom).
jeff
At 05:15 PM 4/29/2009, Rob Lenssen wrote:
Hello Bernd and List,
Thanks alot for all your congratulations!
Actually (luckily) it was not that hard a decision to cut Mike. Originally
it was fractured at that side :-).
The stone consist of cm-sized dark L4 clasts (Fa 25.58+0.53, Fs 22.2+0.31)
in LL6 (Fa 31.53±0.64, Fs 26.54+0.44) material.
Cheers,
Rob
----- Original Message ----- From: <[email protected]>
To: <[email protected]>
Sent: Wednesday, April 29, 2009 10:25 PM
Subject: [meteorite-list] Rob L's NWA 5764
LL6-L4,the first ever LL-L chondrite
Hi Rob and List,
First of all, sincere congrats on such an
"exotic" classification. I am eagerly waiting
for Jeff Grossman's comments! Well, slashes
(e.g. L4/5) indicate transitional classes
whereas hyphens (e.g. L5-6) indicate breccias.
In other words, an LL6-L4 chondrite
seems to have an LL6 lithology and, well,...now
it's really getting difficult especially
because the Met.Bull. entry doesn't give any
details,...is the L4 lithology incorporated
(embedded) into an LL6 matrix (?), is there a clear-cut boundary between an LL6
lithology and an L4 lithology (something like
this: left part of the stone LL6, right part
L4) or are there L4 islands floating in an LL6 "sea" or, maybe vica versa?
Curious minds just wanna know ;-)
Best wishes,
Bernd
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______________________________________________
http://www.meteoritecentral.com
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[email protected]
http://six.pairlist.net/mailman/listinfo/meteorite-list
Dr. Jeffrey N. Grossman phone: (703) 648-6184
US Geological Survey fax: (703) 648-6383
954 National Center
Reston, VA 20192, USA
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