On Su Oct 10, 2010, the National Geographic channel airs
a documentary about the giant crystal cave (Cueva de los
Cristales) in Naica, Mexico.
http://news.nationalgeographic.com/news/bigphotos/82948445.html
If you have not seen this, you are missing something. It may
even convert some students to crystallography...
BR
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Bernhard Rupp
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