[Rockhounds] funky feldpsar and micro kyanite photos

DonH donhalterman at verizon.net
Sun Jul 15 22:01:34 PDT 2007


Howdy,

This is what happens when the earth has a bad tummy and hurls up before 
the magma is properly digested.

http://mysite.verizon.net/resqkdq4/messy-feldspar.jpg

I was looking for nice clean feldspars to analyze and came across this 
in a thin section.  These complex crystals are all around us, often in 
road gravel, but must be seen under magnification and with crossed 
polarizers.  This is a wonderful mix of minerals but all the inclusions 
and lack of equilibrium mean there is no way I can analyze the crystal 
and get anything meaningful.  Scope: Meiji RZ with ring light with Nikon 
Coolpix 5000 on trinoc with Leitz Periplan 10x/18 eyepiece; closeup mode 
with FINE detail; thin section between crossed polarizers, width of xtal 
~3mm.

This shot makes me miss film.  It looked good on the preview monitor, 
but the white balance was all screwed up when I viewed the photo, and 
this was the best correction I could do in a few minutes.  You can see 
the shape well, but the color is a little washed out and the highlights 
are too bright.  Same setup, mag. 50x, with iris stopped down to enhance 
depth of field.

http://mysite.verizon.net/resqkdq4/tiny-kyanite.jpg


Don





More information about the Rockhounds mailing list