“New insights into the fine-grained, opaque selenide veinlets of the Sierra de Cacheuta, Mendoza Province, Argentina. Photo 6. Goethite (g) pseudomorph after ankerite (?) cemented by acicular malachite (m) embedded in clausthalite (cl, white). Polished section, reflected light image, width 1 mm, plane polarized light. Günter Grundmann photo, Frank N. Keutsch collection. For further explanations see reference: „The Sierra de Cacheuta Vein-Type Se Mineralization, Mendoza Province, Argentina.“ By Günter Grundmann and Hans-Jürgen Förster. In: Minerals 2018, 8, 127; doi:10.3390/min8040127. ”