Lengenbach quarry in the Binn Valley, Wallis, Switzerland is one of the most remarkable mineral localities in Europe, if not the world. Bizarrely, it does not present the rich diversity of colours in large displayable specimens that places like Tsumeb, Broken Hill (Australia) and Franklin do, but in its own quietly unassuming way it has knocked out a remarkable 51 Type Species, all mostly in a backdrop of bright white 'marble'. This superb miniature specimen from the outstanding systematic species collection assembled by brothers Martin and Michael Günther (1951-2007 & 1956-2021) features one of these, a 8 mm wide, blocky Dufrenoysite crystal. This is an important, older specimen, being accompanied by an earlier (c. 1960s) Georg Jasker (Hamburg) collection label detailing the crystal faces present on the Dufrenoysite. A quality Lengenbach rarity.