[meteorite-list] petrological type

From: Jeff Grossman <jngrossman_at_meteoritecentral.com>
Date: Fri, 11 Apr 2014 20:22:34 -0400
Message-ID: <5348874A.6090008_at_gmail.com>

Answer: you can't. The classification scheme is lousy.

Jeff

On 4/11/2014 1:21 PM, Michael Mulgrew wrote:
> Two sequences, one for aqueous alteration and one for thermal
> metamorphism (http://www.meteoritemarket.com/PetTypeGroup.jpg). Makes
> one wonder how we would classify a meteorite that is both thermally
> and aqueously altered...
>
>
> Michael in so. Cal.
> IMCA 3963
>
> On Fri, Apr 11, 2014 at 10:14 AM, Francesco Moser <cojack at tiscali.it> wrote:
>> Hello, I have a question about chondrites' petrological type number assigned
>> after the letters (like H, L, CM or CR ...).
>> I have just read something in internet but I think I have misunderstood
>> something.
>>
>> Are the numbers from 1 to 7 in sequence or there are two different
>> sequences: 1 to 2 - 3 to 7 ??
>> 1 to 2 is for the aqueous alteration degree in carbonaceous chodrites (1
>> high degree, 2 low degree)
>> 3 to 7 is for thermal metamorphism degree?
>>
>>
>> Thanks a lot
>>
>> Ciao
>>
>> <x>x<x>x<x>
>> Francesco
>>
>>
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Received on Fri 11 Apr 2014 08:22:34 PM PDT