Quartz (19th century)

specimen number:
1052600

location:
Goddenbach, Idar-Oberstein, Birkenfeld, Rhineland-Palatinate, Germany

description:
A fine 19th century example of an amethyst geode from this famous area. In very good condition. At one time the specimen was part of the collection of Wilhelm Hoyer. An antique label comes with the specimen as shown at the end of the video.

The Galgenberg quarry at Goddenbach, located near Idar-Oberstein within the Birkenfeld District of Rhineland-Palatinate, Germany, is a historic European mineral locality famous for producing classic amethyst geodes and sparkling agate nodules. Geologically, these quartz-filled pockets are hosted within Permian-age tholeiitic basalt and andesite volcanic lava flows belonging to the extensive Nahe Basin magmatic suite. During the late cooling stages of this volcanic activity roughly 280 million years ago, escaping gases formed large, hollow vesicular cavities inside the viscous lava sheets, which were subsequently infiltrated by silica-rich hydrothermal fluids that slowly precipitated concentric layers of colorful chalcedony followed by internal linings of deep purple amethyst crystals. Historically, the Goddenbach site was operated primarily as an open-cast stone quarry for regional road construction material and basalt aggregate rather than an underground gemstone mine, with operations peaking during the late nineteenth century and the first half of the twentieth century. Active industrial quarrying routinely breached these hard volcanic gas pockets, providing a steady supply of fine specimens to the world-famous gemstone cutting and polishing industry of nearby Idar-Oberstein until commercial extraction wound down and permanently ceased around the mid-twentieth century.

Wilhelm Hoyer (1849-1913) was a prominent German engineer and mineral collector based in Hanover, whose professional work in railway construction and geology facilitated the assembly of a significant mineralogical collection. Geologically, Hoyer was noted for his deep expertise in the Mesozoic formations of northwestern Germany, particularly the Hildesheim area, where he meticulously documented and collected specimens from active quarries and construction sites. His collection was scientifically important for its comprehensive representation of regional minerals and fossils, reflecting the systematic approach of 19th-century European collectors who bridged the gap between industrial mining and academic mineralogy. Historically, Hoyer was active in the latter half of the 1800s and early 1900s, contributing numerous papers to geological societies and maintaining professional ties with major institutions of his era. Following his death, his extensive mineralogical and paleontological holdings were integrated into the collections of the University of Gottingen and the Prussian Geological Survey in Berlin, where they continue to serve as vital reference materials for researchers through 2026.

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