“Black botryoidal Birnessite (not analysed) on unidentified matrix Locality on label: Kunkskopf, Eifel, Rheinland Pfalz, B.R.D. The label possibly dates to the period from 1949 to 1990, during which time Germany was split into the "Bundesrepublik Deutschland" ("West Germany") and the Deutsche Demokratische Republik ("East Germany") Acquired from Natalia Desor on eBay in May 2016”