Metallic galena - Khrushchev Mine (Bulgaria)

The galena of the Khrushchev mine (near the mines of Madan, province of Smolyan) in Bulgaria is distinguished by its matt silver color. Its crystals, almost all tabular (a large flat face on top), are modified parallelepipeds. This metal is a lead sulphide called silver-lead because it often contains silver ore and that is why it was mined. In 1906 Karl Ferdinand Braun and Guglielmo Marconi used a Galena crystal to separate the waves and make a radio. This will be the beginning of the reception of radio on galena posts. But the galena of the Khrushchev mine has a unique crystallization, and its crystals form incredibly modern and matte blocks. If you look closely you can imagine a science fiction megalopolis...