Stephanite and Pyragyrite

Very rare material from an old mining area. From the Einigkeit Mine, founded in 1516 on a rock slope in the Erzgebirge a mine that worked on Ag, later Co and As and, finally, U ores. In the Svornost mine, uranium ore was extracted systematically for the first time in the world, an achievement that dates back to the 19th century. In 1898, Marie Curie isolated the radioactive elements radium and polonium for the first time in Jáchymov ores. The Einigkeit mine is also known for the discovery of a series of uranium-containing minerals which were first described at this location (as of March 2018; there are 15 such minerals).