Bournonite (''cogwheel'' twins) with Calcite on Chalcopyrite

Item Description

A lovely association specimen from Trepča featuring a few "cogwheel"-shaped twinned groups of metallic silvery Bournonite measuring up to 8 mm across, associated with vitreous, colorless, translucent crystals of Calcite measuring up to 1.5 cm across, sitting on brassy metallic Chalcopyrite with underlain Sphalerite on matrix. Classic and rarely seen material from Trepča, not from contemporary mining, but several decades ago.
From the collection of Kurt Hefendehl (#8 Y), a well-known German collector all over Europe with worldwide contacts to dealers and collectors. He started collecting seriously at the age of 14 and his great and varied worldwide collection reached over 6000 pieces. He was very active mineralogically until shortly before his passing in 2020 at the age of 82. Considering his collection had a large number of pieces, it still had an unusually high standard of quality from most worldwide localities. He particularly specialized in all classics as well as minerals of the Black Forest, where he spent much time collecting. His Black Forest and German subcollections went to his good friend Wolfgang Wendel. We at The Arkenstone have the privilege of offering the remainder of this great worldwide collection over the coming months and years through our various platforms.