(Steinbissäge (Steinbistunnel), Gremmelsbach, Triberg, Schwarzwald, Baden-Württemberg, Deutschland)
Pegmatite inclusions in the Triberg granite complex, exposed in 1987 during the construction of the B33 road tunnel.
Ref.:
- Erzgräber 1988(2), 104-119
- K. Walenta: "Die Mineralien des Schwarzwaldes", Weise (Munich), 1992