Galena, Calcite and Chalcopyrite-
Madan ore field, Rhodope Mts, Smolyan Oblast, Bulgaria.
12 cm across
Galena with skeletal growth in some crystals, with a partial coating of Calcite and scattered gold Chalcopyrite.
The Madan ore field, known since ancient times, exploited in the Middle Ages and extensively mined during the last 50 years, producing over 95 Megatons of ores (mostly lead, Zinc and some Silver ) in more than 40 underground mines.
