Karl-August adit, Kropbach, Staufen im Breisgau, Breisgau-Hochschwarzwald, Freiburg Region, Baden-Württemberg, Germany
Found inside the old mine in the 90' years. Some sphalerite is located on the back side of this specimen.
© klaus ludwig
Quartz specimen, found inside the mine lots of years ago by local collectors. A small piece of baryte is visible in the middle of this specimen.
The location is directly near by the street in the middle of the photo
The small village of Kropbach, near by the location
The mine entry is located below
Maybe some hundred years old