This is a petrified agatized wood limb slice specimen which has been cut and polished on one side and which was collected from Wyoming. This piece measures 27.97mm long by 22.82mm wide and would be an excellent addition to any rock and mineral collection. I combine shipping on multiple buys so be sure to check out my eBay store Mountainamma's Marketplace where I have thousands of items to browse. For buyers of multiple items please message me for help combining shipping fees before you buy.