Fayalite, Cristobalite in Obsidian - Inyo County, California, USA
 An approximately 4 cm cristobalite sphere with fayalite crystals in lustrous black obsidian from the Coso Hot Springs deposit, Inyo County, California, USA. With a historical find-site label from before 1940 from the private collection of Anton Berger, Mödling, ex. Peter Pichler.