Alunogen and Pickeringite crystals from Dubnik, Slovakia– micromount as unique piece
This aesthetic specimen displays a finely crystalline aggregate of Alunogen and Pickeringite in pale yellow to white tones. The crystals are small but clearly visible, with a glassy luster, forming a dense, slightly shimmering surface. The combination of color and texture creates a visually appealing example of sulfate-rich secondary mineralization.
Alunogen and Pickeringite are hydrated sulfates that form in the oxidation zones of sulfide deposits. The co-occurrence of both minerals on a single specimen is typical for localities like Dubník and is especially valued by collectors of rare secondary sulfates.
Geology & Origin:
Dubník, located in Slovakia, is a classic locality for sulfide-rich ore deposits undergoing intense weathering. In the oxidation zone, sulfates such as Alunogen and Pickeringite form through reactions between sulfur-rich solutions and aluminosilicate rocks. Specimens like this one are fragile yet striking examples of secondary mineral formation.