Intrusives

A medium-grained granite from the Llano Uplift (color, 441Kb) quartz is red, plagioclase is blue, k-spar is maroon, biotite is black. Sample courtesy of D. Barker.

Another image from the same medium-grained granite (color, 441Kb) quartz is red, feldspar is blue.

An image showing a luminescence halo around an inclusion in quartz from another Llano granite (color, 107Kb).

A production of:
Robert M. Reed
Department of Geological Sciences
University of Texas at Austin
rmr@uts.cc.utexas.edu