In August 2014 I took a ride on a Harley Davidson Road King around Flathead Lake, Montana, visiting rock shops to find Montana Agate (also called moss agate), a chalcedony with black moss-like inclusions found in Yellowstone river riverbeds.
Rock shops visited: Junction Rock Shop, Montana Within Rock Shop LLC, Kehoe’s Agate Shop, Mineralholics LLC, The Treasure Outpost in Whitefish, Rocks and Things Metaphysical.