Color vs. B&W images for a zircon. Sample is a finely-layered quartzo-feldspathic gneiss from the Llano Uplift of central Texas. Are the zircons of igneous or metamorphic origin? I'm leaning towards igneous with a narrow metamorphic rim.
A production of:
Robert M. Reed
Department of Geological Sciences
University of Texas at Austin
rmr@uts.cc.utexas.edu