[meteorite-list] Primitive Achondrite Question

[MexicoDoug]

There are relict chondrules identifyable in LL7's according to the 
definition I read, though if you dig through David Weir's or Dr. 
Bunch's websites you will probably get updated information.

So, it can't be an achondrite, primitive or not.  If anything it would 
have to be a "highly evolved" chondrite; --- same logic we just saw 
with Al Haggounia 001 not being an aubrite = chondrule .. not an aubrite

but in that Al Haggounia case, chondrules that were not completely 
mineralized with replacements are present, and Greg Hupe has an 
unambiguous chondrule that he kindly shared with me that is extremely 
well defined (dropping it to a "3" in that case assuming not 100% 
relict).

What happens when a chondrite is just past the metamorphic stage that 
chondrules are no longer identifyable is probably a variable process 
causing confusion among classifications of sparcely occuring chondrules 
in 6's and those of 7's.  Must be a bit to come up with uniform 
criteria since nature has her own sometimes cryptic ways.  It would 
only get interesting if different parts of the same rock get baked in a 
non-uniform oven.

Kindest wishes
Doug


-----Original Message-----
From: Ruben Garcia <mrmeteorite at gmail.com>
To: Meteorite List <meteorite-list at meteoritecentral.com>
Sent: Mon, Dec 5, 2011 8:23 pm
Subject: [meteorite-list] Primitive Achondrite Question


Hi all,

I just bought a smallish collection and several of the slices that
came with are NWA 3100. Mike Farmer's card was included and lists NWA
3100 as an LL7.  The Met-Bul calls NWA 3100 a Primitive achondrite -
not an LL7.

My question is this,

Does LL7 denote a particular Primitive achondrite? If so which one? If
not then what type is this?

BTW - I think Ted Bunch did the classification

--
Rock On!

Ruben Garcia

Website: http://www.mr-meteorite.net
Articles: http://www.meteorite.com/blog/
Videos: http://www.youtube.com/profile?user=meteorfright#p/u
______________________________________________
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-list