Berzelianite - rich, rare Selenide
Bukov Mine, Rozna, Zdar nad Sazavou District
7.8 x 7 x 3.1 CM (cabinet)
A fine and rich specimen of the rare Copper Selenide Berzelianite. While far from pretty (for many people an ugly specie) this is very large and fine for the specie and shows well the Berzelianite and its alterations to other Copper Selenides. The brown sooty material and the dark metallic versions of the specie are both well-exposed. It seems some associated Tiemannite is present also. There are not very many Selenides in the mineral world, and the deposit at the long closed Bukov Mine (Czech Republic) was perhaps the best known classic source of Copper Selenides. The mineral has a long and rich history being named by James Dana (father of modern mineralogy) for Jakob Berzelius who was the creator of the periodic table, symbols of the Elements and chemical notation, and often called the father of analytic Chemistry. Described in 1850 shortly after the death of Berzelius, in honor of his discovery of the element Selenium and at least 5 other elements. This specimen was collected in 1970 when this could still be found at the site.