[Clay-talk] Antw: mysterious clay - Clay-talk Digest, Vol 8, Issue 1

Franz Ottner franz.ottner at boku.ac.at
Fri Oct 2 07:03:29 EDT 2015

Hi Georg,
did you try to repeat the measurements and did you get the same
mysterious results??
Check the glycol too.
Greetings from Vienna

Franz Ottner
Institut für Angewandte Geologie
Universität für Bodenkultur Wien
Peter Jordan Strasse 70
A-1190 Wien
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8:16 >>>
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Today's Topics:

   1. Mysterious XRD patterns (Georg Grathoff)


Message: 1
Date: Thu, 1 Oct 2015 15:25:33 +0200
From: Georg Grathoff <Grathoff at uni-greifswald.de>
To: clay-talk at minlists.org
Subject: [Clay-talk] Mysterious XRD patterns
<CABdoBJTRn25wG8MN=CWK9P4mnMvQ6XUcp1PNZWieA-TQLSx4Pw at mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Dear friends of clay,
recently a student came to me with the following mystery.  He collected
suspension of the <2um size fraction and prepared a glass slide with
size fraction.  He ran first  the air dried, second gycol solvated (60C
48hrs) and third 550C heated (1hr) scan of the same slide.  Now the
mystery: In the glycol solvated pattern calcite dissapears while
phase or phases appear with peaks at 5.88, 5.2, 3.13 and 2.82
After heating the mystery phase disapears again and the calcite
in intensity.  I attached the XRD scans of the three patterns in black
air dried, in blue EG and in red heated.
Has anyone seen this before, what could have happened?
Thanks for any suggestions.
Georg Grathoff

Georg Grathoff
Institut f?r Geographie und Geologie
Friedrich-Ludwig-Jahn-Str. 17A
17487 Greifswald

Tel. +49 3834 864584
Sekr. +49 3834 864570
Fax +49 3834 864572
Email: Grathoff at uni-greifswald.de
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