Sharp crystals of calcite to 2.2 cm in size on a crystallized quartz matrix. In good condition.The Krushev Dol mine, located in the Madan ore field of the Rhodope Mountains in southern Bulgaria, is part of a mining region with an ancient history of extraction dating back to the 4th to 5th centuries BC. Modern industrial-scale underground mining in the district developed heavily through the 20th century under state and joint-stock operations, continuing into modern times. Geologically, the deposit is situated within the Central Rhodope Dome, consisting of high-grade metamorphic rocks and marble cut by hydrothermal vein systems. The ore bodies formed via Eocene to Oligocene hydrothermal activity, producing rich polymetallic mineralization consisting primarily of lead, zinc, and copper sulfides hosted within steep fault zones and carbonate-rich rocks.
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