Gersdorffite

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Granular massive gersdorffite from this classic locality.The city of Goslar, located at the northern foot of the Harz Mountains in Lower Saxony, Germany, is inseparable from the Rammelsberg ore deposit, one of the largest and longest-lived mineral sites in human history. Geologically, the Rammelsberg is a massive sulfide deposit formed during the Devonian period through seafloor hydrothermal activity, resulting in dense layers of galena, sphalerite, and chalcopyrite within shale and slate host rocks. The district is a notable locality for gersdorffite, a nickel arsenic sulfide mineral that typically occurs as metallic, silver-white to steel-gray octahedral crystals or granular masses, often found in hydrothermal veins alongside other sulfosalts. Historically, mining and quarrying at Rammelsberg began as early as the 3rd century AD based on archaeological evidence, with continuous industrial operations documented from approximately 968 AD until the mine's final closure on June 30, 1988. Throughout its millennium of operation, the site provided the silver wealth that fueled the Holy Roman Empire and established Goslar as a major center of the Hanseatic League. Today, the Rammelsberg mine is a UNESCO World Heritage site and serves as a premier destination for geological education and the study of medieval industrial techniques through 2026.