Libethenite, Euchroite – Libethen, Hungary
 Former collection K. Kontrus, 1952
 Former P. Pichler Collection, 1968
 Richly decorated, historic libethenite specimen with original label by Dipl. Ing. K. Kontrus from 1952. A thin layer of blue-green euchroite is visible on the reverse.
 Rare collector's item from the 1950s.