(Irregger Schwaig, Gebiet Ladinger Spitze - Speikkogel, Saualpe, Kärnten, Österreich)
Mineralized clefts in eklogite-amphibolites. This locality was already well known in the 19th century, when it produced fine specimens of prehnite.
Ref.: G. Niedermayr, I. Praetzel: Mineralien Kärntens, 1995