Calcite

specimen number:
1831112

location:
Pribram, Bohemia, Czech Republic

description:

A superb example from this old locality showing multi-generation crystallized calcite without matrix. These are sometimes referred to as Cone in Cone formation. In great condition all around.

The Pribram mining district, situated in Central Bohemia, Czech Republic, was a legendary underground mining center renowned for its immense production of silver, lead, zinc, and uranium. Geologically, the district is located within the Barrandian Neoproterozoic basement complex and is characterized by a dense system of structurally controlled polymetallic hydrothermal veins that cut across thick sequences of sandstones, shales, and greywackes near the margin of the Central Bohemian Pluton. Late-stage, high-temperature hydrothermal fluids filled regional fractures, precipitating massive sulfide ores including galena, sphalerite, siderite, and silver-bearing minerals, which later underwent complex secondary mineralization to produce world-class specimens of pyromorphite, cerussite, and native silver. Historically, surface panning and shallow trenching for silver and lead date back to at least the fourteenth century, but large-scale industrial underground operations commenced in the late eighteenth century, transforming Pribram into one of the deepest mining centers in the world by the late nineteenth century. Following World War II, the district experienced a major industrial shift when rich, deep-seated hydrothermal uranium deposits were discovered, leading to intensive Soviet-directed extraction that ran parallel to the traditional base-metal operations. The historic silver and base-metal mines operated continuously until their depletion forced closure in 1978, while the extensive uranium mining operations persisted until 1991 when political changes and environmental concerns brought a permanent end to all active underground extraction.

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