(Grube Morassina, Schmiedefeld, Reichmannsdorf, Thüringer Wald, Thüringen, Deutschland)
Ancient mine in alum shales, worked from 1683 to 1860 for sulphates that were used for sulphuric acid production. In 1993, it was re-opened as a tourist mine.
Ref.:
- http://www.untertage.com/cms/content/view/58/2/