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Brianyoungite: Zn3(CO3,SO4)(OH)4
Comments: Silky white aggregates of brianyoungite with small yellow crystals of sulfur on sphalerite. Location: St Johannes Mine, Wolkenstein, Erzgebirge, Saxony, Germany. Scale: Picture size 3 mm. © Thomas Witzke / Abraxas-Verlag