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Another systematic killer: native selenium with sulfur in vial (as old as the hills...) from the known selenium mineral locality Tilkerode, Harz (type locality of naumannite and eskebornite and - as some experts say - even clausthalite). The vial is about 5,5 cm in length. (Author: Andreas Gerstenberg)

Another systematic killer: native selenium with sulfur in vial (as old as the hills...) from the known selenium mineral locality Tilkerode, Harz (type locality of naumannite and eskebornite and - as some experts say - even clausthalite). The vial is about 5,5 cm in length. (Author: Andreas Gerstenberg)

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