Walker, K. (Ed.), 2018c. Stonechat: The e-Newsletter of the Implement Petrology Group: Volume 7, pp 8. CONTENTS Editorial Message from the Chair of IPG, Alison Sheridan Norwegian Ragstone, Rob Ixer The IPG represented at UISPP World Congress, Paris, Katharine Walker The Obsidian Museum of Japan, Pete Topping 3D modelling of carved stone balls by National Museums Scotland’s Hugo Anderson-Whymark New publications DOWNLOAD PDF Available here.