Thanks Melinda, Alan and Bernd and all!
My next question would have been; Would it be safe to say if I see
polysynthetic twinning, odds are it's low-Ca cpx, but Melinda
pretty much answered this.
I have certainly seen this but the jury is out if I've seen other types
of twinning while playing around on the scope.
Jim
On 2/22/2014 9:25 AM, Alan Rubin wrote:
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: [email protected]
website: http://cosmochemists.igpp.ucla.edu/Rubin.html
----- Original Message ----- From: "Jim Wooddell"
<[email protected]>
To: <[email protected]>
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
[email protected]
http://pages.suddenlink.net/chondrule/
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Jim Wooddell
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http://pages.suddenlink.net/chondrule/
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