[meteorite-list] Types of twinning in chondrites?

From: Alan Rubin <aerubin_at_meteoritecentral.com>
Date: Sat, 22 Feb 2014 08:25:22 -0800
Message-ID: <9B712AECD6C645BF9210A7C2B41BBD2D_at_igpp.ucla.edu>

The most common type of twinning in chondrules in unmetamorphosed chondrites
is found in low-Ca clinopyroxenes. It is polysynthetic twinning -- it looks
like the pyroxene grains have narrow stripes. These disappear when
temperatures go above 630 C or so and won't be found in orthopyroxene.
Alan


Alan Rubin
Institute of Geophysics and Planetary Physics
University of California
3845 Slichter Hall
603 Charles Young Dr. E
Los Angeles, CA 90095-1567
phone: 310-825-3202
e-mail: aerubin at ucla.edu
website: http://cosmochemists.igpp.ucla.edu/Rubin.html


----- Original Message -----
From: "Jim Wooddell" <jim.wooddell at suddenlink.net>
To: <meteorite-list at meteoritecentral.com>
Sent: Saturday, February 22, 2014 5:52 AM
Subject: [meteorite-list] Types of twinning in chondrites?


> Hi all,
>
> I was wondering, for those that are experienced with petrology, what types
> of crystal twinning to do see the most in OC's?
>
> Thanks!
>
> Jim
>
> --
> Jim Wooddell
> jim.wooddell at suddenlink.net
> http://pages.suddenlink.net/chondrule/
>
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Received on Sat 22 Feb 2014 11:25:22 AM PST