Zeunerite with Uranopilite

specimen number:
1052692

location:
Jachymov, Karlovy Vary, Czech Republic

description:
Green platy crystals and masses of zeunerite across the top of matrix with yellow green uranopilite.the specimen comes with an antique label as shown at the end of the video. This label provides an acquisition date of 1908.

The Jachymov mining district (historically known by its classic German name, Sankt Joachimsthal), situated on the southern slopes of the Ore Mountains (Erzgebirge) in the Karlovy Vary Region of the Czech Republic, is one of the most famous and historically significant polymetallic localities on Earth, serving as the birthplace of the silver thaler coin and the type locality for uranium discovery. Geologically, this world-class deposit represents a classic Five-Element vein system (silver, uranium, cobalt, nickel, and bismuth) hosted within a complex sequence of Neoproterozoic to Paleozoic metamorphic schists and phyllites that were intruded by Variscan-age granites. Hydrothermal mineralizing fluids moving through deep fault fractures precipitated thick, vertical veins rich in primary uraninite (pitchblende), native silver, and complex arsenides, which later underwent localized supergene oxidation to create spectacular secondary green torbernite, yellow uranopilite, and orange liebigite crystal crusts. Historically, a massive silver rush triggered the commencement of intensive underground mining and localized quarrying in 1516, causing the settlement to explode into a major European minting center under the Kingdom of Bohemia. Following centuries of intermittent silver and cobalt extraction, the district underwent a dramatic industrial rebirth in the mid-nineteenth century when the state opened the world's first industrial uranium mine in 1853 to supply raw materials for glass coloring, later providing the exact pitchblende ore used by Marie and Pierre Curie to isolate radium in 1898. Following World War II, the Soviet Union occupied the district, utilizing forced labor and political prisoners to aggressively extract massive volumes of strategic uranium ore from 1945 until the economic depletion of the deep-level vein networks forced the permanent cessation of all commercial mining operations in 1964. Through 2026, while the Svornost shaft remains open solely to pump thermal radon waters for regional spas, the historic waste piles and extensive museum collections of Jachymov stand as an absolute pinnacle of classic European mineralogy, with its antique, centuries-old specimens intensely prized by advanced collectors for their unmatched historical provenance and scientific legacy.

The mineral dealership of C. Riemer, based in Magdeburg, Germany, during the late nineteenth and early twentieth centuries, operated as a notable regional distributor of specialized geological and mineralogical specimens tailored for educational institutions, academic researchers, and advanced private collectors. Functioning alongside contemporaneous central German enterprises, Riemer specialized in sourcing, documenting, and preparing mineral suites that prominently featured classic structural occurrences from regional German volcanic zones, the Harz Mountains, and the famous salt and potash deposits of the Saxony-Anhalt region, such as Stassfurt and Leopoldshall. His commercial business catalogs and meticulously curated specimen assemblies targeted the expanding demands of technical universities and scientific associations during a highly active period of European mineralogical classification and economic geology. The dealership provided meticulously labeled reference pieces, frequently mounted or resting on distinct, hand-written or stamped white paper merchant tags that explicitly preserved the precise mineral chemistry, crystallization style, and localized mine provenance.

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