Some really great images of complex zoning in quartz from silicified volcanic rocks in west Texas. Some of the light blue luminescence is due to fluorite. Sample courtesy of J. Rubin and J. Price.
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1 (Color, 129 Kb)
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2 (Color, 527 Kb)
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3 (Color, 402 Kb)
A production of:
Robert M. Reed
Department of Geological Sciences
University of Texas at Austin
rmr@uts.cc.utexas.edu