This collection consists of 80 colour photographs taken by Gary Deirmendjian in 2010. The photographs document how trachyte stone was used in the Sydney built environment. They were taken for a book by Robert Irving, Ron Powell and Noel Irving titled ‘Sydney's hard rock story: the cultural heritage of trachyte’ (Leura, Heritage Publishing, 2014). These images show details of trachyte stone on facades, steps and pillars of buildings, as well as kerbs and gutters within Sydney’s CBD.