“New insights into the gold-bearing Pt-Pd-Hg-Pb-Sb-Se mineralization of the Tilkerode mining district - Detail from veinlet sample No. 4154 tilkerodeite-cotype specimen: Reflected plane-polarized light digital image in air showing native gold (yellow) with clausthalite (light-blue-grey), and tiemannite (medium-grey) in dolomite matrix (dark-grey). Width of image 1 mm. For further explanations see reference: „Tilkerodeite, Pd2HgSe3, a New Platinum-Group Mineral from Tilkerode, Harz Mountains, Germany” by Chi Ma, Hans-Jürgen Förster and Günter Grundmann. Crystals 2020, 10(8), 687; https://doi.org/10.3390/cryst10080687 - 08 Aug 2020 G. Grundmann photo. ”