Once again, the thin section was a generous loan from Jim Strope.  http://www.catchafallingstar.com The information about NWA 482 is listed in the 160X group of images.

 

True story!  I sat down to work on posting images to this Gallery and that led to more photographing which led to me wanting higher magnification, which let to "I need more light than the 500W" I have in my scope.  Anyway, it's 1 degree out side so I bring the oxy/ acetylene welder in the house.  My wife about killed me.  I set up a lamp house to accommodate a 750W Photo Optic Halogen Oxide Bulb.  I needed a heat shield on the desk to keep from burning in.  I have a heat absorption filter in the train so I don't heat the slides!  The light goes through MANY lenses, two prisms and one mirror before the slide so my expensive and borrowed slide is safe.

 

Why did I need more light?  Just as with a camera, if you stop down the aperture you increase the depth of focus.  I can achieve better clarity at these (relatively high for Xpol) magnifications with the field aperture and diaphragm really screwed down.  Let me know what you think!

These are NWA 482 in standard cross polarized light at 400X with the addition of a retardation filter.  I say standard Xpol because I am working on reflected cross polarized light with thin sections and the results are shown in the images of NWA 998 Martian (also on loan from Jim)