Eifel Weibern Location: 50.24 ° N, 7.08° E Elevation: 481 m Weiberner Tuff is broken into quarries in the Vulkaneifel near Weibern near Mayen in Rhineland-Palatinate. In this deposit, there is a particularly fine-grained layer called flute stone. This natural stone, a phonolite, was formed in the Quaternary volcanic activity. Weibener Tuff (wikipedia) HOME              Weibern, 23.06.2002