Hematite after Calcite

specimen number:
2312126

location:
Shaft 38, Niederschlema, Bad Schlema, Saxony, Germany

description:
A cluster of sharp large scalenohedral calcite crystals, these now completely replaced by hematite. In terrific condition.

Shaft 38, located in the Niederschlema and Bad Schlema district within the Erzgebirge of Saxony, Germany, is part of the extensive Schlema-Alberoda uranium mining field. Historically, the site was developed during the post-World War II era under the Soviet-German SDAG Wismut corporation, becoming a major extraction point within one of the largest uranium mining operations in Europe. Geologically, the deposit is situated within complex metamorphic and gneissic host rocks intersected by multi-stage hydrothermal vein systems. These structural veins formed through complex fluid events that deposited massive and pitchblende-rich uranium ores alongside a diverse suite of associated metallic sulfides, selenides, and carbonate gangue minerals.

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