Pyrite cluster mineral specimen from the Madan field in Bulgaria. 

A wonderful example of a cluster of well formed intergrown shiny golden Pyrite crystals from the Madan ore field in Bulgaria.
Madan, in the Rhodope Mountains of Bulgaria, just north of the frontier with Greece, is an ancient ore-miners’ settlement. The history of mining in the Madan region extends back at least as far as the Thracians in the fifth century B.C. where the extraction of lead ore began.
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