Michael Farmer Meteorites - Sale Catalog,黑曜石OBSIDIAN,14.4 Kg Permian Petrified Wood Log. Origin: Paraguay. 19 X 19 X 20 Cm. - Etsy,黑曜石OBSIDIAN,Eastward expansion of the Neolithic from the Zagros: Obsidian provenience from Sang-e Chakhmaq, a late 8th-early 7th millennia BCE Neolithic site in northeast Iran - ScienceDirect