Mixed mineral specimen contains at least Galena, Calcite, Quartz from the Bulgaria region. 
Galena base with quartz and calcite crystals growing atop. 
 
Calcite and quartz can peacefully coexist
Galena typically is found in hydrothermal veins in association with sphalerite, marcasite, chalcopyrite, cerussite, anglesite, dolomite, calcite, quartz, barite, and fluorite.