A fantastic example from the Madan ore field consisting of shiny metallic black well formed tetrahedral Sphalerite crystals most of which are sharp with well defined edges and faces and have a fantastic shiny black metallic luster on silvery 'melted' Galena.
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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2 окт 2024
