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This piece is a fantastic and classic example of historical mining in the Upper Harz Mountains, specifically from the well-known Bad Grund region. The combination of golden chalcopyrite, acicular quartz, and steel-gray tetrahedrite crystals showcases the typical hydrothermal vein formation of this region in a particularly aesthetically pleasing way. The interplay of textures is especially captivating, as the fine, clear quartz prisms form a highly lustrous matrix against which the metallic sulfides contrast perfectly.
The golden chalcopyrite crystals exhibit a beautiful, iridescent tarnish in places. These blue-violet tarnish colors result from a very thin, natural oxidation of the surface. However, the steel-gray tetrahedrites in the center of the specimen are a true mineralogical highlight with their characteristic tetrahedral symmetry. The fact that these delicate tetrahedrite aggregates have been so perfectly preserved and isolated within the intricate quartz bedrock clearly highlights the quality of this specimen.
At 5.5 cm in size, the piece is ideally sized for a cabinet specimen. For collectors of regional German minerals or historical Harz Mountain collections, this specimen is an exceptionally valuable and prestigious collector's item due to the freshness of the crystals, the pronounced paragenesis, and the high level of detail.
