East Ord Mountains Orbicular Rhyolite (California)


522241 mE 3830849 mN 1200m (UTM11N NAD83) (Google Maps)

Land Status:

Bureau of Land Management


Interesting 'orbicular' rhyolite can be found at the base of East Ord Mountain in the Mojave Desert. The material appears to occur in pods or dikes within host volcanics that make up the mountain; the coordinates give the location of just one of such features. The curious texture is probably a form of spherulitic devitrification rather than a true orbicular texture.


Gem Trails of Southern California, James R. Mitchell

Site visited on 1/16/2013Page created on 11/15/2014