DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Tetrahedrite, a copper-antimony sulphide mineral (Cu2Fe)12Sb4S13. It fits the cubic crystal system and often forms shiny and sharply edged metallic crystals in the form of tetrahedrons. Found in Hohrhausen in Westerwald, Germany. Width 55mm.
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