[meteorite-list] Classification of Chondrites

From: Rhett Bourland <rbourlan_at_meteoritecentral.com>
Date: Thu Apr 22 09:50:24 2004
Message-ID: <IOEBKAHMGFBDJMOFGDFNMEKJDIAA.rbourlan_at_evansville.net>

Thank you!! Now the question must be asked, how does one determine the
difference between 3's, 4's, 5's, and 6's? I understand that chondrules
lose their boundaries and that the olivine and pyroxene become homogenous
but what are the criteria to determine this?
Thanks again,
Rhett Bourland
www.asteroidmodels.com
www.asteroidmodels.com/personal
www.meteoritecollectors.org

-----Original Message-----
From: Bernd Pauli HD [mailto:bernd.pauli_at_lehrer1.rz.uni-karlsruhe.de]
Sent: Sunday, April 07, 2002 1:25 PM
To: rbourlan_at_evansville.net
Cc: Fred Olsen; meteorite-list
Subject: Re: [meteorite-list] Classification of Chondrites


Rhett Bourland wrote:

> What are the fayalite values that determine
> whether a certain meteorite is H, L, or LL?

Hi Rhett and List,

H chondrites usually have Fa14-Fa21.
L chondrites usually have Fa20-Fa24.
LL chondrites usually have Fa24-Fa33.

Two things should be noted:

1) There is an area of overlap with regard to the H and L chondrites

2) We must be careful with the unequilibrated H3's, L3's and LL3's
    because they usually have a range of values and a peak value.

When you plot the Fa values on a diagram,
the three groups become easily recognizable.


Best wishes,

Bernd
Received on Sun 07 Apr 2002 02:54:00 PM PDT