Calcite (twin) with Quartz

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Colorless opaque crystals of calcite, several nicely twinned and measuring to 2.0 cm in size, coming off matrix.The Krushev dol Mine, situated within the prolific Madan ore field of the Smolyan Province in the Rhodope Mountains of southern Bulgaria, is a prominent underground lead and zinc mining operation. Geologically, the deposit is part of the Central Rhodope dome, consisting of metamorphic host rocks intruded by Tertiary magmatic activity and cut by hydrothermal quartz-sulfide veins and skarn-associated ore bodies. Mineralogically, the mine is world-famous among collectors for producing exceptional specimens of galena, sphalerite, chalcopyrite, and associated quartz and calcite crystals. Historically, mining in the broader Madan region dates back to ancient Thracian times in the 4th to 5th centuries BC, with intensive modern industrial exploitation developing through twentieth-century state enterprises and continuing into the modern era for both commercial ore and fine mineral specimens.