One very interesting, strongly weathered, large cabinet-size specimen of black sphalerite-marmatite and quartz, covered by very well-developed chalcopyrite crystals, lately internally corroded and replaced by pyrite.
One beautiful cabinet-size specimen of standing clear ti translucent barite crystals, overgrowth by pyrite and pyrrhotite, lately coated by bornite and covellite.
One unique specimen of galena, overgrowth by large bright chalcopyrite crystals with very aesthetic striation on the crystal faces and followed by quartz and black sphalerite – marmatite. In the end of the crystallization process crystalized several beautiful hallow rhodochrosite crystals, following the shape of dissolved calcite crystals.
An outstanding and extremely rare specimen of pseudomorph of pyrite after sphalerite and chalcopyrite, on quartz.. Giudurska mine, Erma reka, Zlatograd area, Bulgaria
An excellent specimen of galena cubic crystals, overwrought by chalcopyrite and followed by sphalerite and quartz
One very nice , cabinet size specimen of well terminated cubic pyrite crystals, covered by quartz strongly oxidated to bornite in some parts of the specimen.
An aesthetic cabinet sized specimen of large chalcopyrite crystals, singenetically developed with galena and sphalerite, followed by quartz. In the last stage of crystallization, oxidation creates a thin coating of bornite and covellite.