Green obsidian—a stone as transparent as glass with iron and chromium impurities that create its rare color—was considered a luxury trade good in pre- and post-Columbian Central American culture. Archaeologists have found green obsidian hundreds to thousands of miles away from its origin. For example, it was discovered in a ritual cremation in Belize and in Mayan temples. So why was it found in the Texas panhandle and how does silicon play a role?