At 08:38 17/10/2000, Armel wrote:

>You cannot even find it in the mineralogy database :

But you can find a pretty 3D drawing on 
http://www.ill.fr/dif/3D-crystals/layers.html (thanks to Garrison Sposito). 
Further references are given on: 
http://www.ill.fr/dif/3D-crystals/credits.html, and since Dewey Moore was 
kind enough to try to teach me about clay minerals, you might like the 
reference to his book:

Moore, D.M. and Reynolds, R.C. Jr. X-ray Diffraction and the Identification 
and Analysis of Clay Minerals, 2nd Ed., Oxford University Press (1997).

Dr Alan W. Hewat, Diffraction Group Leader,
Institut Laue-Langevin Grenoble FRANCE <[EMAIL PROTECTED]> tel (33) 4.76.20.72.13
http://www.ill.fr/dif/AlanHewat.htm   fax (33) 
4.76.20.76.48   ftp://ftp.ill.fr/pub/dif

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