Once again, the thin section was a generous loan from Jim Strope.  http://www.catchafallingstar.com The information about NWA 998 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.