in <3A4EA1E7.EA26A5C0@online.no> Tor Olav Kristensen wrote:

>I find these optical properties very fascinating.
>

Nice stuff to play with.
Here's a realy old one I dug up.
<http://members.home.nl/seedseven/stress_test.jpg>
Top is between crossed pola's.
Bottom, a 1/4 lamba plate is added (I think).

With a polarisation microscope I made hundreds of pictures of
minerals and "schliffs" from bore hole samples while I worked
for an oil company.


Ingo

-- 
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