(B33 Straßentunnel, Hornberg, Schwarzwald, Baden-Württemberg, Deutschland))
A road tunnel built between 2001 and late 2005, cutting through Triberg granite. The minerals were found on dumps of the excavated rock material.
Refs.:
- Gröbner, J. & Schrenk, D. (2005): Die Mineralien des Tunnels bei Hornberg. Der Erzgräber 19, 17-25. (in German)
- http://www.rst.vs.bw.schule.de/Referate/Tunnel/Geologie/index.html
- http://www.tunnel-hornberg.de