Heidberg Mine, Eckenhagen, Reichshof, Oberbergischer Kreis, Cologne, North Rhine-Westphalia, Germany
This image is copyrighted. Unauthorized reproduction prohibited. Any unauthorized use will be prosecuted according to the law on copyright. 1.93 mm Posnjakite crystal. Collection & photo Matteo Chinellato
© Chinellato Matteo
The Heidberg Mine in ~1905.
© Original photographer unknown