[meteorite-list] Types of twinning in chondrites?

[Alan Rubin]

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/
>
> ______________________________________________
>
> Visit the Archives at http://www.meteorite-list-archives.com
> Meteorite-list mailing list
> Meteorite-list at meteoritecentral.com
> http://six.pairlist.net/mailman/listinfo/meteorite-list