[meteorite-list] LL7 Chondrites

From: Adam Hupe <adamhupe_at_meteoritecentral.com>
Date: Thu Apr 22 10:32:54 2004
Message-ID: <088801c412c3$22e56c40$ad971018_at_attbi.com>

Hi Mike and List,

Is this classification provisional or has it been approved by the NomCom.
When we submitted NWA 969, an LL7 they were very careful to make sure it met
Dodd's criteria. Anyway it is a nice looking stone whatever the NomCom
decides to call it.

All the best,

Adam


----- Original Message -----
From: "Michael Farmer" <meteoritehunter_at_comcast.net>
To: "David Weir" <dgweir_at_earthlink.net>; "Adam Hupe" <adamhupe@comcast.net>
Cc: <bernd.pauli_at_paulinet.de>; <meteorite-list@meteoritecentral.com>
Sent: Thursday, March 25, 2004 3:30 PM
Subject: Re: [meteorite-list] LL7 Chondrites


> Dr Ted Bunch did the classification. I have to belive that he knows what
he
> it doing. The pieces are up on my website right now.
> See them here
> http://www.meteoriteguy.com/nwa2092.htm
> http://www.meteoriteguy.com/nwa20922.htm
> Price is $30.00 gram today only.
> Mike Farmer
> ----- Original Message -----
> From: "David Weir" <dgweir_at_earthlink.net>
> To: "Adam Hupe" <adamhupe_at_comcast.net>
> Cc: <bernd.pauli_at_paulinet.de>; <meteorite-list@meteoritecentral.com>
> Sent: Thursday, March 25, 2004 4:11 PM
> Subject: Re: [meteorite-list] LL7 Chondrites
>
>
> > Hey Adam,
> >
> > Yes, I agree with you. Very perceptive. The two types are mutually
> > exclusive based on the definition of Dodd. Type 7 ordinary chondrites
> > were originally defined by Dodd et al. (1975) according to specific
> > petrographic characteristics. They listed three metamorphic criteria to
> > distinguish between petrographic types 6 and 7:
> >
> > 1.the presence of poorly defined chondrules in type 6, but only relict
> > chondrules in type 7
> >
> > 2.low-Ca pyroxenes in type 6 contain no more than 1.0 wt% CaO (1.0 wt% =
> > ~1.9 mol% Wo), but more than 1.0 wt% in type 7; conversely, the CaO
> > content of high-Ca pyroxenes decreases from type 6 to type 7
> >
> > 3.feldspar grains gradually coarsen to reach a size of at least 0.1 mm
> > in type 7
> >
> > Perhaps this is one of those confused cases of classification in which
> > different labs call things by different terminology. Could they have
> > found both petrographic phases in the stone and used the slash to
> > indicate this? Who did the classification?
> >
> > Regards,
> > David
> >
> > ______________________________________________
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> >
>
>
>
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Received on Thu 25 Mar 2004 06:44:37 PM PST