Location: 50.413 ° N, 7.154° E
Elevation: 454 m
Tuff (from the Italian tufo) is a type of rock consisting of consolidated volcanic ash ejected from vents during a volcanic eruption. Tuff is sometimes called tufa, particularly when used as construction material, although tufa also refers to a quite different rock. Rock that contains greater than 50% tuff is considered tuffaceous.
Photo: Rolf Cosar Weibern, 16.08.2008