Tilkerode - Mansfeld - East Harz, Germany / tilkerode235-MVC-651L.JPG

Tilkerode - Mansfeld - East Harz, Germany/tilkerode235

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Finally we have found it -- in this shaft "Selenkupferkies" ("Selenium copper pyrite") was discovered: CuFeSe₂. It was the seleniferous ore that was processed in Oker {LINK: to Oker} and which gave up the thallium discovered by Crookes in England.