[meteorite-list] Rob L's NWA 5764 LL6-L4, the first ever LL-L chondrite

From: Jeff Grossman <jgrossman_at_meteoritecentral.com>
Date: Thu, 30 Apr 2009 08:40:44 -0400
Message-ID: <7.0.0.16.2.20090430083558.04697e08_at_usgs.gov>

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: <bernd.pauli at paulinet.de>
>To: <Meteorite-list at meteoritecentral.com>
>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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>
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Dr. Jeffrey N. Grossman phone: (703) 648-6184
US Geological Survey fax: (703) 648-6383
954 National Center
Reston, VA 20192, USA
Received on Thu 30 Apr 2009 08:40:44 AM PDT