Photo from http://www.agatelady.com/photo-gallery-mineral-of-the-month-winter-2011.html

These are colorful banded agates found in San Rafael in Mendoza Province, Argentina.  They were discovered by the Argentinean actor and rockhound Luis de los Santos in 1992. He named them Condor agates because of the eponymous birds native to the mountains.  Sometimes knowing where a rock was found is just as important as what it’s made of.