Calcite

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A large grouping of snow white scalenohedral calcite crystals. In good condition, one smaller crystal on the backside appears to be cleaved, but upon close inspection this is naturally crystallized.The Droujba Mine, situated within the prominent Laki ore district of the Plovdiv Province in southern Bulgaria, is part of a historic mining region with roots stretching back to ancient Thracian and Roman times. Modern industrial scale operations in the area developed primarily during the 20th century as part of Bulgaria's organized state-led mining sector for lead and zinc extraction. Geologically, the deposit is set within the complex metamorphic and igneous terrain of the Rhodope Massif. It is characterized by hydrothermal vein systems formed through Tertiary magmatic activity, producing rich polymetallic mineralizations consisting chiefly of galena, sphalerite, and pyrite, alongside well-crystallized gangue minerals like calcite and quartz.